yes - read previous posts and find someone local to you on 3dhubs.

At least talk to them and go see a 3d printer in action. And handle some printed bits.

Nylon is completely different to pla - tougher but an awful lot more flexible. And a bastard to print with unless it's on an sls machine.

Pla should be fine. For that design I'd probably use 3mm for the base and 2mm for the side walls, maybe 1.2 depending on how much they'd need to flex.
But go find a 3d printer and you'll answer most of your questions much easier :-)