Ok I've made a number of checks and the problem is as follow:
1) on a Vanillia 4.12.2 instllation with Modct 5.30 the mod works fine once we add the fix I uploaded earlier
2) on this same installation BUT with the SAS_Flyable_AI_Aircraft enabled, the mod crashes
The reason: the cockpit files called by the mod are both named Similarly to the cockpit classes of the original Swordfish1 mod - Although they have different content!
Moreover the gunner classes still contains conditional reference to the original swordfish1 mod - and as these original classes are present in the files of the SAS_Flyable_AI_Aircraft - this causes the to game enter in a loop.
The solution - to re-write all the classes of this mod, with different names, and to rename the cockpit folders with different names
It's what I did and it worked (I did not rename the cockpit TempestMkV folder as it seems to include a repaint that betters the Tempest cockpit - though I feel that the glass material used still needs to be improved )
OK - the rewritten mod is here (delete all the files of the previously installed Swordfish II mod as they would keep interfering with the SAS_Flyable pack):
https://www.mediafire.com/?c6bzc67go1j39bqair.ini additions are the same:
SwordfishMk.II air.SW2 1 NOINFO gb01 SUMMER
I hope it will solve the problem