bought this 2day, need sum help

[layotn20]

as above bought this 2day, really happy with it. just a couple of things really:
1) when i get my sierra diff and drive shafts will they bolt straight in (no cutting etc)
2)also what chassis is it as im confused because you can get, +2/+4 etc whats mine
3) what steering rack does it take ?

sorry to be so thick loll
help if i put the link loll http://www.locostbuilders.co.uk/view...php?tid=129051