Well, there, I’ve gone and done it.
- I ground down one side of the 4th spacer in each motor on my belt sander. (It was quite easy, and I get to keep the four-legged mounting.)
- I did go with the block on Y (with the stock switch mounted on the front edge of the now-right plate).
- I added a limit switch spacer on X, since things hit the various nuts that are now in front of the extrusion.
- I altered my soft limit on X (accounting for the nuts and such on both sides), and conveniently, my laser mount now clears the front plate.
- I flipped the Y bit on $3 (Direction port invert, mask), changing $3 from 6 to 4.
And after carefully checking everything (movement, limit switches, soft limits) in UGS, I’m going to call it a success.
Oh, and thanks for the drill guide. I printed it while I was disassembing everything, and it made the new holes quite convenient.