Good Idea!....i actually meant to do that and forgot! Until I get to later today from the shoulder to the brass retaining cap is roughly 1/2" with it being split roughly 1/4" M10 thread for the brass nut and the other 1/4" for the retaining cap. But total inside mod will be 1/2" minus your box thickness. Will post up pics later.
It should fit then! Looks like I'll be ordering a 510 connector and an SX350 chip from you tonight!