Oh, your wonderous custom, the only board I've seen that sensibly uses standard caps without worrying about not having a straight edge. Surprised you found 3u caps for it in the first place! How much space is there if you put on 2.75 caps in those positions? It's only 0.125u each side, might look OK.
"Sensibly"?
) But yes, avoiding the issue of compatibility in crackpot variations was the aim of the game. A decent idea ruined by the 3u ...
Speaking of which, it's not the gap, it's the stabilizers. The best alternative is a 1.5u which is the largest key without a stab (iirc? maybe 1.25u? I forget). SP have a few 3u every so often (R3 so a bad space bar with the sharp-ish corners). I also found a few warped monstrosities on TaoBao that let me use Laser, but with the wrong colour, and quality is as bad as you'd imagine. One day I'll get my lovely GiD 3u but that day is not this day today. R1 or R2 is most comfortable for thumb, SA convex tops don't exist just yet.
But we digress.
What's your crackpot missing from the TKL set? Between you and me and everyone else, I'm not holding much hope for ISO or spacebars, we're not Massdrop-ping this and historically ISO doesn't make the cut, but we shall see once the ball rolls around the [GB] lap. All I can recommend is you bite the bullet, like I did, and embrace the ANSI. fwiw, the novelties will probably be expanded to add some set-branding to the R3 Caps and Enter, as is the current trend in sets.
I'm itching to get this going, feeling good so far, let's hope energy and excitement hasn't been too attenuated.