You should remove paint in these areas:
1. Where the volume pot mounts.
2. Where the 5 lug strip mounts by the 9 pin socket.
3. Where the #8 grounding screw mounts by the IEC power entry module.
When you paint the correct side, you'll also probably want to pass a 1/4" drill bit through the holes for the transformer screws, as there will be two layers of paint there that will make fitting the hardware difficult.
I would also like to thank you for being thoughtful about your project and correcting the issue before proceeding with your build.
-PB