I made this quick fixture to help me with the #4 flathead screws that will be going near the middle of the bank. If you look close, you'll see three arrows (pencil marks) that will help locate the bank against those surfaces. However, only two of those three surfaces will be used while I'm drilling any of my holes.
 

I have my bank located against the wood tooling below. While working on the hole that you see below, my work piece is against the top and side of my wood tooling. And I can do the opposite hole by turning my work piece 180 degrees.

Then when those are drilled, I move my drill downwards to the bottom holes and use the bottom of the wood tooling this time, and the end of it like before.
 

This semi gloss clear spray should provide many years of protection for this wooden surface.
 

Here it is all finished. However, it's hard to photograph a clear surface like this plastic because it reflects everything so much.