I know of the very popular SR20DET conversion, but has anyone tried, or heard of anyone, doing a VG30DETT conversion on a 240sx?

probably... there's better swaps out there tho

Go into to the 240SX forum and just search "VG30". It's been brought up a number of times and I believe there was even a few links to pictures of just this kind of project.

Really a KA-T or SR20 would cheaper and more suited to the S13-14 platform. Especially the KA-T considering stupid amount of money people are willing to pay for beat up SR20 motors.

not worthwhile at all...too much customization and the increased difficulty of performing minor maintenance tasks that come along with the VG30DETT let alone in a smaller chassis.