Its not that bad mate
after you weld the mounts in - no firewall bashing/cutting= fits shifter location but engine sits far forward or cut the wall and better balance? up to u
i also hear the R33 non turbo gearbox makes shifter location so much better which means less cutting into ur shell.
Heaps of guys on the forum has done it already, just search around. I'm in the middle of working on one with a mate also.
I'm not too sure how much extra or if its worth using the Pulsar version justr because its FWD and for 20v 4age (FWD) to RWD cars, waterpump/lines and dizzy needed to be converted
and the lack of power without the turbo probably not worth the work?
If possible, i'd sell the SR and probably buy a 4age to bolt in without any fabrications. (but thats just me)
Other guys who'd finish their SRbuilds would probably have a better understanding of the difficulty