Sounds like with the PSU you needed a de-solder sucker (https://www.jaycar.com.au/metal-desolder-tool/p/TH1862). I cringe at the potential damage with the Dremel!
What were the modifications for? Did the cables need to go in the other direction, the last image wont show for me... :(
Looking...
I have been following for a little while now but finally decided to sign up to this forum just because of this build! Looks great and can't wait to get my hands on one if/when they are available to us plebs!