Hey Adam its Sherlock, Tunneys mate, the one that had that dumped as Cressida
A lot of people cut and shut there own Engine cross members using the SR mounts as far as I know, here's a link to a guy that has recently done it:
Also with diffs, Hilux diffs are commonly used, also if you can get your hands on it, an E series or F series diff out of a Tarago can be used with minimal mods to it. Using an 86 diff with LSD might not be strong enough behind an SR20DET and would be expensive if you had to replace it a few times
Welcome to the site, Keep this thread helpful people!