6 speed conversion
Yes it can be done, even on the IL model. The driveshaft may need to be custom modified by a specialty shop but it is definetly doable. Check the Euro side of the ETK and see if the IL over there was available with a manual gearbox. I fancied doing a E32 740il in my youth but may end up converting my E38 740i when the tranny dies again just for fun.
Just a hint. Take two short drive shafts and make one long one. The rest is cross reference research and bolt on.