Fyron,
I'm new to the forum and comparatively new to SEIV Gold, though I played the original SEIV and SEIII quite a bit. Since you asked for feedback, I thought I'd pipe in and say that I started using the deluxe mod a couple of weeks ago and have been having a bLast (no pun intended). I've been using it with the TDM modpack, the Ultimate Strategies Mod, and a few other minor things, such as a set of system names from Stars!, as many races as I could find (and many that I had to hack into shape for 1.78 though I haven't spent any time optimizing them), and even some custom CD music that I grabbed from X - Beyond the Frontier, which is great background for SEIV. Currently I'm having fun working on my own AI and seeing how it fares against those of the other races, some of which are very well-done.
When I initially installed FQM Deluxe, I did run into the problem with "file not found" mentioned by another person here. I think I tracked it down to the presence of several empty folders that are created by the straight extraction of the contents of the zip file. Since I deleted the empty folders, the problem hasn't re-surfaced, so that may have been it.
I'm looking foward to the new goodies you have, and I'm glad there will be no cube planets.
Thanks much for a fantastic mod!