The doors require, if I remember correctly, disassembly of the trap body. You can see how the replacement doors look here:
https://thangs.com/designer/Shwalamazul ... oors-40989 As for the Kenner proton gun gears, I haven't ever seen any replacements for those... most people remove them so it CAN'T make that noise.
As for the difficulty on the trap pedal and inner mechanism for the trap, the pedal needs to have a certain squish to get that burst of air to open the trap doors. While there are materials like TPU that are rubbery, it isn't the right kind of consistency to work right. It's been years since I've seen it, but the inner mechanism that blows the air from the pedal so the doors open is designed in such a way that you need to print it with support, which would completely block the air flow and removing them post-print would damage the part to near uselessness.
No idea if anyone sells the parts you're looking for. If you want 3D printed copies and live in the US, shoot me a PM and we can talk. If you just looking for legit parts, junker traps on Ebay is your best bet.