I've traveled with my hhkb, custom tkl, even a bare pcb 60% with no issue within canada.. just a few weird looks and some questions about artisans. I have also brought my disassembled PC internals in my carry-on from canada to the USA luckily the security person I had was like "oh my son builds PC's" and asked me the specs of everything, on the way back they didn't even check it.