What about radiator (does S13 fit?), brakes?, $400 for engineers certificate, Tunnel mods, Engine Mounts?, forget the intercooler if budget is the aim, relays and wire, new timing belt ($120), Gearbox and Engine oil/filters $60, Weighbridge costs, New tires after the first drive around the block

I think you have at least another $1000 of unspec'ed expenses. The frontcut will certainly make the job easier. Make sure the frontcut is complete. $2000 is a great price for a frontcut though.

Probably not enough in the budget for your beers, there might be enough for a 6 pack for your mate, for when you tell him he'll need a bit more money.

Chris