The rear beam is t45 now on mine so are the connecting rods to the uprights, it's the front we are discussing...I wasn't clear on that. The front is likely to be tubular and t45 instead of the heavier Wrc cradle. I like the idea of chassis mounted engine to make dropping the suspension out very easy and like you say, it could save the engine in a shunt.

Funnily enough we were chatting today about the weight of the supra diff but we will keep it for now and consider ally diffs later (billet Supra but more likely something yank and modern)