Probably more information than you want, but here's how I decided to deal with Tuesday's dilemma:
I will trim the combination HST units to 4" (instead of 4-1/4") ...
... and I will cut the background rectangles and squares from a 2-1/2" strip (instead of 2-3/8"). Then I will make sure the unfinished block is 9-1/2" (instead of 9-7/8").
I don't think the block on the left looks disproportionate, do you? Just ignore the fact it spins in the "wrong" direction.
So I kitted up 9 block sets yesterday ...
... and cut squares for over 20 more.
Bear in mind that each set of squares makes two sets of combination units. I'll be killing two birds with one stone! Just need to decide what I'll do with the second set of combination HSTs.
Bring on RSC-22!!