Cloud

[Lappy9000]

I think when it's all put together it should probably be a something like a mercurial full blade.

And those things are freakin' beastly.

Mechanical Standpoint
I'd be willing to change some stuff around. This is most definitely an exotic weapon, and would probably incur penalties for non-users (I'm using Mercurial Greatsword as a basis).

From Supreme Geasser's estimations (Scimitar= 4lbs, 1 Greatsword= 8lbs, 2 Longswords= 8lbs, 2 Shortswords= 4lbs) that's at least 24 lbs right there. A fullblade (Large-Size Longsword) weighs a good 23 lbs. There's probably about a -4 or -5 penalty to attack roles for non-proficient users.

You could almost consider the sword to be a Large weapon (I have no idea of the Buster Sword's actual proportions).

Ceiling009 is probably about right, Full Blade Mercurial sword sounds about right. So what, 2d8 dmg, 'bout 30-40 lbs cost a thousand or two gold? Cloud's would be Masterwork, but that doesn't mean they all have to be.

Non-Mechanical Standpoint
6 Swords in 1? Freakin' awesome!