First off you know about this place right?
zeroforum?id=132
Secondly there was a guy in 240sxgen chat and also in that subforum named irax, i think. Who was trying to get a kit together to make a direct swap into a 240.
Just need to fab mounts and maybe a pan to get the motor where you want it.
Then wire it up to an older maxima ecu. swap out throttle bodies to a cable driven vq TB.
Then there are shifter kits around to get it mounted right.
zerothread?id=405173
One nissan master tech built but I'm not sure how close to 100% functional 240sx with a 350z driven train, wheel sensors and all.
You'll probably come across it in the VQ forum.