i don't know how 'pretty' your shell is, but your best bet would probably be to drive your current gazelle down, find a locally registered s12 and swap everything over. to get sa rego on it you'll need to have an ID check done, which can be done at a cop shop or a place just down the road from regency and if they don't deem it roadworthy they will defect you
there's plenty of events on at mallala, check out the website for times and dates - unfortunately no off street drags.
parts and workshops? got everything you would need really - go see the boys at smooth garage for mechanical and wait til the new WW store opens up soonish