it's a 7.2 K model....i know Very high.

The mod is using a railgun which is abt 8.5k.If SOURCEcan handle THAT it can also handle this too.I know extra pressure.BUT CAN'T IT BE ACCEPTABLE.

if i use cleanup is distorts the original shape.Could u plz let me know how use it wisely.

Why i find dark shades on the gray surface in maya.(both in the viewport and in the render scence)

is there any specific procedure or rules(except low poly count) to follow.And if the are what are they?

How do i know a model is ready to go and it will not cause
any trouble in game engine or while texturing in other modeling softwares.

The file is attached.So, let me know where are the errors(except poly count)