FWIW- I've built one, buying more parts for 2nd build as we speak. Shot'em for years.
The only special tools I would buy are roll pin punches. The instructions list a couple of others, but you really don't need them. Here are the ones I bought. BTW the instructions are great and if you have any mechanical ability at all you can build one from the kit.
Lyman 4-Piece Roll Pin Punch Set, from [url=http://www.midwayusa.com/ebrowse.exe/browse?TabID=4&CategoryID=8826&CategoryString=649+***]Midway[/url]
Scroll to near bottom of page Product #: 191653
Status: Available
Price: $10.21
under $14 shipped.
These punches help keep the punch attached to the roll pin while driving. It is possible to get by w/o these, and some folks do get by w/o them. IMHO they really help.
good luck! I hope the "Black Rifle Desease" bug doesn't bite too hard.
[url=users.zoominternet.net/~pcfitz]P.I.G.S.[/url]