Reverse Engineered Object - Progress III

I know this post was meant to be for our finalized renders, but I hit so many roadblocks and errors that I haven't made much progress despite spending hours and hours on it. On the one hand, I've learned a couple new commands and ways of working through my troubleshooting, but on the other hand I've ended up spending a LOT of time on troubleshooting. Some of the main issues I've had/am currently having are certain pieces not aligning as they should despite the care I put into measuring, boolean operations failing, and my biggest killer: getting too ahead of myself and joining objects + filleting their edges before they were finished. By the time I realized I had more to add to the pieces I had filleted, I wasn't able to undo it, and I ended up having to build the pieces all over again. I think I just got too excited seeing the pieces so close to being finished!! So even though I'm super excited to play with Keyshot, I just have to keep on troubleshooting until...