Hi Vince!
Your build is looking good! I am not an ESB TK expert, but here is a bit of feedback
1) The gap between the sides should be ok. There is a minimum distance for EIB, but I don't think there is one for basic level.
2) I have used rust-oleum spray paint on elastic first with success. I applied adhesion promoter first though. There may be better solutions out there for you, but I wanted to share.
3) It looks like you have the darker blue ab buttons. These could work to get you approved, but I know a lot of troopers are using a lighter blue now. This is what I used: http://trooperbay.com/humbrol-french-blue-14/
Again, nice job on your build!