Dragonborn, warforged, humanoid (human)… what is a man? A miserable little pile of subtypes! But enough talk…
Rejected joke: "…I 'ardly know 'er!"

Quote Originally Posted by Watcher
Watcher, Dragonborn Warforged Scout Scout 4 / Ranger 1 / Scorpion Wraith 1

Base Stat Racial Mod Level Final
Str 10 -2 8
Dex 15 +2 -2 + 1 16
Con 8 +2 10
Int 12 -2 10
Wis 14 13
Cha 13 -2 11

Level Class Base Attack Bonus Fort Save Ref Save Will Save Skills Feats Class Features
1st Scout 1 +0 +0 +2 +0 Hide 4, Move Silently 4, Survival 4, Spot 4, Listen 4, Search 4, Craft(Poisonmaking) 4, Knowledge (Nature) 4 Hidden Talent (Psionic Minor Creation) Skirmish +1d6, Trapfinding
2nd Scout 2 +1 +0 +3 +0 Hide 5, Move Silently 5, Survival 5, Spot 5, Listen 4, Search 5, Craft(Poisonmaking) 5, Knowledge (Nature) 4, Concentration 1 - Battle Fortitude +1, Uncanny Dodge
3rd Scout 3 +2 +1 +3 +1 Hide 6, Move Silently 6, Survival 6, Spot 6, Listen 5, Search 5, Craft(Poisonmaking) 6, Knowledge (Nature) 4, Concentration 2 Blind-Fight Skirmish +1d6/+1, Dungeon Specialist [climb 10ft.]
4th Scout 4 +3 +1 +4 +1 Hide 7, Move Silently 7, Survival 7, Spot 7, Listen 5, Search 5, Craft(Poisonmaking) 7, Knowledge (Nature) 5, Concentration 3 Improved Initiative Bonus Feat
5th Ranger 1 +4 +3 +6 +1 Hide 8, Move Silently 8, Survival 7, Spot 7, Listen 5, Search 5, Craft(Poisonmaking) 7, Knowledge (Nature) 5, Concentration 7 Track Favored Enemy (Arcanist) +2, Wild Empathy
6th Scorpion Wraith 1 +5 +3 +8 +1 Hide 9, Move Silently 9, Survival 7, Spot 9, Listen 5, Search 5, Craft(Poisonmaking) 9, Knowledge (Nature) 5, Concentration 7 Flyby Attack Poison Use, Sudden Strike +1d6

Spoiler: Level 1
Watcher has some skill monkey skills, isn't particularly accurate. However, they can create Drow Poison with Psionic Minor Creation twice a day, with a huge number of doses that last for an hour. Being a construct, there's no need to worry about poisoning yourself.

Spoiler: Level 3
With their new climb speed and ability to glide as a dragonborn, you now have more options for enabling Skirmish damage. You're still mainly relying on poison to be useful in a fight, however.

Spoiler: Level 5
We have 5 HD, which enables actual flight from Dragonborn. Fatigue kicks in after a while and stops us, but you're a Warforged, so you don't care. It also makes up for our low land speed. Favored Enemy bonuses against anyone with spellcasting or SLAs opens up a lot of options for damage bonuses. Ranger is our only level with Concentration as a class skill, so we pick it up here to enable regaining psionic focus later on and qualify for Psionic Meditation. Wild Empathy lets us qualify for Scorpion Wraith, and Swift Hunter will let us avoid losing a second point of BAB while maintaining access to Improved Skirmish later.

Spoiler: Level 6
Scorpion Wraith gives us more precision damage, qualifies us for Craven for more again, and grants Poison Use to qualify us for Poison Expert. It's full BAB so we can pick up Fell Shot, and lets us fill our our skill list. Flyby Attack is great for moving into range, loosing a shot, and then falling back into some cover to hide in again.

Epic Level Feat Notes
1st Swift Hunter Increases the bonus provided by Favored Enemy (Arcanists) to +4, grants Favored Enemy (Construct) as well to expand precision damage targets. Skirmish bonus becomes +2d6/+1.
2nd Improved Skirmish Qualified through Swift Hunter, increases Skirmish bonus to +4d6/+3.
3rd Point Blank Shot Improves hit and damage, but mainly here because it's a prereq.
4th Psionic Shot First shot of combat does another 2d6 damage, and if we're able to sneak and snipe we can apply it repeatedly.
5th Fell Shot Huge to-hit bonus by making shots touch attacks. Guarantees poison application.
6th Psionic Meditation Lets us use Fell Shot every turn if we need the to-hit bonus, using gliding/falling as a Dragonborn to enable Skirmish, or regain focus while moving to help with stealth.
7th Psicrystal Affinity Artiste personality ups our Craft check bonus to more reliably make Black Lotus Extract, along with Aid Another on important checks and great scouting options, since it inherits our ranks and has a +12 size mod to Hide.
8th Able Sniper Helps our hide checks and attack rolls when sniping and moving - most of the time we'll be using Flyby Attack to move up to exactly 30ft away, shooting and then falling back into cover.
9th Craven Extra +6 to damage output.
10th Poison Expert (Injury) Increases DC of saves against Unconsciousness from Drow Poison and others.

Spoiler: Final Profile

N Medium humanoid (human)
Init*+7*Senses*Listen +8, Spot +12

AC*15,*touch*13,*flat-footed*12, uncanny dodge, Skirmish +3
HP*25 (6 HD)
Speed*20 ft. (4 squares), Fly 30ft., Climb 10ft. ; Flyby Attack
Melee*Glaive +4 (1d8-1/x3)
Ranged Masterwork Longbow +12 touch (1d6) plus Skirmish, Sudden Strike, poison, Fell Shot, Black Lotus Extract DC20/3d6 Con/3d6 Con, Drow Poison DC14/Unconsciousness/Unconsciousness
Space*5 ft.;*Reach 10 ft.
Base Atk*+5;*Grp*+1
Atk Options Skirmish +4d6/+3, Sudden Strike +1d6+6, Psionic Shot +2d6, Fell Shot (touch)
SLAs (ML 1st) - psionic minor creation 2/day
Abilities*Str 8, Dex 16, Con 10, Int 10, Wis 13, Cha 11
Feats*Hidden Talent, Blind-Fight, Improved Initiative, Track, Flyby Attack, Swift Hunter, Improved Skirmish, Point Blank Shot, Psionic Shot, Fell Shot, Psionic Meditiation, Psicrystal Affinity, Alertness, Able Sniper, Craven, Poison Expert (Injury)
Skills Hide +20 (+24 sniping), Move Silently +14, Survival +10, Spot +14, Listen +10, Search +8, Craft(Poisonmaking) +25, Knowledge (Nature) +7, Concentration +9; psicrystal aid another included
Equipment Mwk Tools (Hide, Craft, Concentration), Use Activated item of CL3 Diving Insight 2/day, whatever offensive/defensive items are appropriate

Spoiler: Sources

Dragonborn [Wings] - Races of the Dragon
Warforged Scout - Monster Manual III
Scout - Complete Adventure
Ranger - PHB
Scorpion Wraith - Secrets of Xen'Drik
Hidden Talent - Expanded Psionics Handbook
Dungeon Specialist - Dungeonscape
Favored Enemy [Arcanist] - Complete Mage
Flyby Attack - various Monster Manuals
Swift Hunter - Complete Scoundrel
Improved Skirmish - Complete Scoundrel
Psionic Shot - Expanded Psionics Handbook
Fell Shot - Expanded Psionics Handbook
Psionic Meditation - Expanded Psionics Handbook
Psicrystal Affinity - Expanded Psionics Handbook
Able Sniper - Races of the Wild
Craven - Champions of Ruin
Poison Expert - Complete Scoundrel