/3/ - 3DCG

>>554390
>grip
Oh, I thought you meant like pic related. Frankly I think you have more issues than hollowing it out (ergonomics, trigger/hand placement). Is this supposed to be a slip-on grip? You mention needing a hole for the grip screw, but also that it wouldn't fit well with other grips. If it's a replacement, I wouldn't worry too much about the internals even considering stress as a cylinder/capsule shape would hollow it out nicely. If it's a slip-on/cover, then you could make the cavity rougher with less points of contact and then maybe wrap it in some sort of volume-y tape for fit (electrical, foam tape).