But the whole thing is meant to screw thru the aluminum blank to the case it looks like. Nothing to screw into under the board I guess... Are those aluminum blanks hollow? I'll have to be careful with the size of a bolt I guess underneath so it doesn't cross anything.
argh...
Does this help?

Yeah it is underneath that board that I am confused by. It screws thru the aluminum blank into tiny little mystery donuts.
Glad I'm thinking about this now.
Bogart has 1 module reserved if I can't use it. ASIC-K, you want some?