Thanks for that long reply micheal. For me MOI is both the easiest modeller and the best converter around!! Please take that as a compliment ;-) I regular work with huge files (i work in the aircraft industry). We also bought CAD loader from luxologu to go with Modo and in my opinion its not a patch on MOI - OK it has nice features where you can assign different levels of mesh details to different parts, however if it has to deal with a large file (+10mb) it is very slow and cumbersome. In my experience in 3D (15 years) the files are not getting any smaller so I need to be able to crack open these files. I have worked with 280mb files in moi in past and it was OK. Maybe it could be a possibility to develop an add on that first looks into the structure of a STP file and you can select just sections of the file at a time to import and convert . . ? But then what do i know . .just a thought?
BTW i do use MOI for about 50% of my modelling, and I use the MAC so i can't thank you enough for pulling that off recently - great work!
matt