So far got quite a bit of progress on my Grebe Mu-1 this evening. Looks like I should probably replace the breadboard as it is a little funky. The outer layers of the plywood have delaminated and are warped. Fortunately I have essentially the same type of plywood and with a bit of staining, it should look like the original. I should be able to transfer the hole patterns from the original without too much difficulty.