Even with a handheld Dremel you can do it in an hour or 2 the first time, and half that for the second, then less. There are only 50 holes and you can't spend more than a minute or 2 on each one, no matter what. Problem is, you either screw up, or you don't, and then you can't go back anyway.
Bring several chisel-point X-acto blades and learn to cut clean flat lines with them. That makes everything a lot easier.
Get a few pieces of scrap lumber and knock this together. It will make everything a lot more stable.