wolverine sparten fcu for reference

wolverine spartan board with all important aspects labeled.
it is roughly correct i would say within .3mm tolerances.

the selector is at the height for the switch to not be depressed (fairly sure that means its in semi) and if you want it to be always depressed is roughly 1.5mm lower. it isnt a button however so if you want select fire you will need a sliding tab that slides from front to back (the other way around will damage the selector.

Happy making, hope this saves you a little time or lets you make something before buying the relatively expensive hardware