Comments on some of the replies and recommendations.

Pneumatic riveter---some guys love 'em, I don't. I bought one when I began my first car and used it for maybe 50% of the rivets. Second car I used it for about 10% (mostly I think just to see if my opinion had changed). Every one since has been done by hand. IMO, the pneumatic is bulky and cumbersome, it's a pain to drag the hose around and I like to seat the rivet and feel it pull by hand. I wound up giving it to a new builder who was going to buy one. After seeing Paul's comments on the Milwaukee fuel powered tool I'd be interested in trying one out to satisfy my curiosity but hand popping 'em really doesn't bother me.

Drill bits---Plain ol' black oxide, no fancy cobalt or titanium. Use #30 rather than 1/8". Buy a Drill doctor and use it often...it will pay for itself.

Dremel---Get a quick change cut off wheel arbor and a big pack of reinforced wheels because you'll probably use that more than anything else.

Cordless drill and impact driver---Absolutely. Pick up 1/4" and 3/8" socket adapters and you'll rarely use a ratchet again!

Clecos---I've got 50 or so which works fine for me. You don't have to fill every hole but some guys like to do so and make a showing of it so if that makes ya' happy go ahead!

Strippers/crimpers---I'll go for inexpensive tools on a lot of things but don't cheap out on these.

Lots more but that's a start!

Jeff