Version 0.6
As there are impatient people who would want to use both Luke's mod and mine (which is not possible in all), I have found a good solution. Yes, it is impossible to use both mods at the same time. But one can add all Luke's UFOs to my mod without checking / mending / modifying them. Even more, this is not very complex to add UFOs from both MapPacks as well! No more problems with U_DISEC3 etc., by the way!
Even if I cannot guarantee (for now) that all Abductors, Terror Ships, Battleships and Supply Ships will function very well, there is no need to use Luke's Extra UFOs any longer. All his UFOs are already in the mod (even if not all have been checked / corrected yet).
I have added them to the current version, numbered 0.6. The version 0.7 will have all Abductors checked (and the ugly looking black triangles in floors removed, I am just working on it), plus their reflected variants (and possibly one or two more maps) that do not exist in this moment. The version 0.8 is planned to have new / checked Terror Ships as well. The version 0.9 will have Supply Ships (they are less in size than Battleships, hence the planned sequence). And finally the version 1.0 will have all UFOs checked. Further versions with Tnarg's UFOs and pyramidal UFOs (unused but present in the game) are expected as well.
Nice using the mod!