Its nice to know in a sense that your kind of restoring it rather than turning into a drift machine like some people choose too, nothing against this offcourse but there also nice to see with full interior.
I agree on the welded diff as i didnt enjoy the ride on the few ive driven with welded diffs.
The s13 diff does not drop straight in although using parts from s13 and s12 diffs you can make a vlsd as members such as 30 psi has done in the past. He is the man to ask about this as ive not yet made one up