This was a cool project. Was fun to put together and it came out looking sharp. I had a hard time finding correct sizes for this on the profile. Maybe they are listed somewhere but they are not in the .stl. So for anyone who needs them: I used 8/32 threaded rods at a little over 13" which I cut with my rotary saw for the 4 connections. I used 8/32 acorn nuts and the two additional spots I just cut a half inch piece of rod and screwed an acorn on them. I used a .6 nozzle for the engine and .4 for the gray blocks and red handles. I had trouble getting the blocks to look good with the gyroid infill so I switched it to honeycomb, same for the handle and I used a .16 profile for the handle with 4 walls. Super cool project and hope that info saves anyone some time in the future:)