Did a swap to 18 last week with several mods and I can list which ones worked and which didnt. Mind you it took me a while to get everything ported over but here's the list I had with respect to the untested mods:
Better mining AI is stable for 17 and 18
Better ship systems stable for both 17 and 18
MineCorp was a total unknown, I'm not even sure I had it installed correctly but it does work on 17, my players are all finding the mines and receiving the resources. (I recommend manual merging since overwriting can break game code)
Command package 100% works on 17, did not generate any problems on 18
Not enough turrets is stable on 17 and was working on 18
Civil turret and fighter range definitely still works on 17 have not tested with 18 (with somed edits, I recommend manually merging to avoid breaking current game code)
Universal system works for both 17 and 18
I realize I'm a total nobody as far as the forums are concerned, and I'm relatively new to Avorion, but I've been modding games for almost a decade, I carefully merged at least 15 mods together off the forums, even some of the older ones, and they all work together for B17.