Not even sure i would bother with n LSD. Find a cheap camry, £500-£1000, S54 box (cheap on ebay all the long day), Woorsport mount, some welding up, a decent clutch, the rest is tinkering. I reckon with a bit of input from on here, under £1000 is achievable.
Never done a Mk3, but i'm pretty sure ChrisT, meself and probably others can help out with the heavy lifting. If you wait for an ideal alignment of planets, you will never do it.