I've attached my second folder of old MP levels (from back when Lix used the original graphics) converted to new graphics. I'd started converting these a long time ago, and I had it in my head that there was a lot still to be done, but looking through them, it looks like the only unfinished one is "Play Bridge (4P)", and you could just reconstruct that by copying a chunk of the 3P level.
All levels would need the number of players and overtime set, and after testing it in the last session, I think Diagonal (8P) should have more builders.
I've cut the overtime on Flying Batter-y Zone to 30 seconds.