Just found some time last 2 weeks to do almost all of the recommended changes. Here they are:
Crotch / Buttplate:
Added a second snap at the buttplate and changed the rivet at crotch piece with a split rivet provided by Echo
Thigh ammo pack:
Changed the former rivets to cap rivets provided by Echo and painted them white
Mic Tips:
replaced mic tips incl. speakers with the original ones
I tried to change the position of the kneeplate, too, but it almost broke by attempt because of the used loctite. So I decided to leave it as it is. Like Dennis already posted, there were Movie-Troopers with the same kind of knee-placement.
I hope you agree with the changes I made and wait for your feedback.
Regards, Tom