I had fun building mine, lots of meticulous fitting !!
I had customized a few 1911's before so had some hands on.
STI fitted frame and slide, mix of Wilson and Ed Brown parts.
Did I mention 10mm chambering.
Whole 'nother bit of research on how to get recoil impulse right (high pressure and velocity v/s low pressure and velocity).
Could have bought a 10mm DW for about the same price as I have in parts - wouldn't have the satisfaction of doing it myself though.