How to Make a Bow-Kata Monk/Fighter?

[Sorinth]

My DM would almost certainly file that under "called shots" and imposes a fairly hefty penalty to trying it (IIRC it's disadvantage and also a negative number to the roll).
It's one reason Battlemaster is fairly important as it's exempt from that rule.

I tread back and forth on that ruling- I do not like the idea of called shots to begin with but if they are in the game then I do expect them to be rather hard.

Fair enough, but this is very much a case of the DM being overly harsh since the rules exists in the DMG and he's making it harder, similarly to how some DMs make hiding virtually useless.