Nice work! I like your key caps too.
About the sticking button, you can open it up and see if it's the switch or the outer button sticking, in which case you could file it or something...
Thanks! The keycaps are combination of PBT DCS (the gray modifier keys), DSA Homing Dish and SA (Ctrl/Alt keys) from PMK, and Gateron PBT blank sets. Bit of a pain as you need two Gateron sets for each board, thanks to needing two NumPad Enters and NumPad 0's for the thumb clusters. You end up with a pile of leftovers.
I've opened up the sticking button and it's the outer button sticking, but haven't been able to figure out how/where it's sticking as it only sticks when pressed at a certain angle.
Also bought Seimitus 24mm buttons but haven't decided if I'm actually going to install them yet.
On a related note, found out there's adapter to use Cherry switches in Sanwa OBSF/OBSC buttons. Unfortunately, OBSF/OBSC buttons are too tall (I think) for the palm button locations.