btw, you might want to start with asking your local arcade... And see if they have any water destroyed cabinets... that they might sell ya..
You know the parts you want... Don't expect to buy any of it at a radio shack.
You really might be able to find a working jamma cabinet for a local source for the price of shipping for some of the parts... Then swap all the junk to a new cabinet... or refurb the one you get.
Troubles will be..
1) Monitor will be old... You can get a new one for 210bucks (189 + 20 bucks shipping.. .what company was it??)... This will be the big money item.
2) Old wiring harness are kinda crap in my opinion. If you get a cab that has been converted... then you probably find a bunch of wirenuts reconnecting parts...
3) Joysticks will be crap... Old joysticks work, but they are SO cheap (especially if you wait for a sale). And new sticks feel so much better.... oh boy did that sound bad

Good luck!