The Enterprise A will have to be redone. I forgot that someone pointed out that it crashes DS4 when you try to render it. I have noticed that too and will attempt to fix it.
I tried your suggestions on the Enterprise A, and it still rendered with triangular chunks of varying sizes missing in the saucer, neck and nacelle pylon areas.
However, as you will be redoing the Enterprise A, it will no doubt be sorted.
Again, you always do sterling work with your conversions, and I look forward to future releases, and hope to see what conversions you have coming next. (hopefully some movie era stuff like the Phobos and Leavenworth).
Oh, and the new Enterprise-D conversion renders like a charm. No loading errors, or issues. She’s great. Awesome work, Matty. :D