I also came to this thread while on a search for Macross 3d. I've found a number of Macross things on Cults3d.com most of which people want some money for, BUT there is one very nice guy offering all his Macross models for free (and he has some very nice things)!
https://cults3d.com/en/users/MiniValks/creations You will have to register to download but that's free too, To find the rest of the Macross stuff just do a search for Macross.