Only suggestion i have at the moment is to consider a slightly longer tube so the button is recessed; that is, the button is not visible from side view but the overall length is unchanged. Improves the looks and avoids pressing by accident, such as when put in pocket.
You took the words right out of my mouth. I was going to ask about this (and the SD and other similar mods) with the button protruding as it is, how easy it would be to accidentally set it off. I wouldnt want it just sitting in my pocket and going off.
A completely recessed switch, so the button is flush with the casing would be amazing.
All in all though, that is one FANTASTIC design you've got there. From what I can see of it, it looks incredible, you obviously put a lot of time and effort into that.
If you think it would be possible to extend that casing just a little bit more so that button is not protruding, I would love to be able to get on your list of interested buyers. I've been looking for a modded alternative to all these things I've got lying around, and so far this looks to be the best I've seen!