Just finished mesh fitting all the holes and circular features in Inventor and exporting STEP files. Got 90% of them. Some of the STL look like they are at lower rez and do not work, so I just converted them to mesh without mesh fit, and I will manually draw surfaces for mating in Solidworks. Now that I think about it I could have drawn them in Inventor, but already exported them all. Should have a working assembly soon, albeit the most interesting assembly I’ve ever put together. Lol. Still, learning a lot from this. Excited to share the results.