Kart EZ-Fit barrel with tools
Brownell's has a set of stones and jigs you can use to fit the hammer sear along with instructions. Supposed to be safe and easy.
Disconnector scraper
Lapping compounds to fit the slide to the frame
Headspace gauges (very important when fitting your own slide/frame/barrel) Excessive headspace is your enemy and it can grow over time...
Calipers, good ones, $40+ I found got me a very accurate pair.
Kunhausen vol 1 and 2 is a must.
USGI parts from ebay, buyer beware of fake parts. You can even get a chrome lined barrel if you want but fitting can be touch and go with a used or already fitted part. USGI slides + barrels come around from time to time.
Cylinder and slide sells the hammer you need along with disconnector and sear.
EGW slidestop.
Wolf mainspring, ISMI recoil spring.
Colt factory grip safeties are available from Brownells and they are similar to the 1911A1 grip safety, you can also get a MSH that matches the A1 from Colt too... Grip safety, trigger, thumb safety and MSH generally need to be USGI for a good match. S&A makes serrated ones that might match.
Pins and barrel links, firing pin, FPS, EGW oversize, ed brown, wilson combat.