This might have been addressed previously to varying degrees - though I still enjoy seeing a bike that was purchased and then completely changed so that, in essence, the only thing original is basically the frame - we can allow head sets, bottom brackets and seat posts but the less original the better, but still in keeping with the spirit of Vintage.
I admit to being caught up in the Winter doldrums and being a bit bored, so if you just can not wait to showcase that special build please feel free. As for my own contribution, this early '70's Garlatti ( as far as I can tell ) sporting 700C wheels and retaining only the original head set is now my around town " tourer" and the 1981 Fuji S12S, sporting only the original seat post and head set is now enjoying a second life as my favorite 650b rando bike. Don't ask how much I invested, we all enjoy the labor of love that even an entry level bike can bring when we want to make it something unique and personal.
Listing the parts used and/or frame mods is always informative, whether on hand or purchased specifically for the build, if you want to.
In the case of the Garlatti I had everything on hand from another frame I stripped down and sold, having to purchase the following:
V.O. 50 cm Rando handlebars
Nitto Technomic 70mm stem
V.O. rear fender tail light
TA Cyclotourist triple crank set ( local co op )
Italian 127mm cartridge bottom bracket
Univeral brake levers ( local co op )
Weinmann center pull brakes ( sourced from friend )
Handlebar tape
Surly rear brake hangar
Brake and shifter cables
The Fuji - On hand: 650b wheel set, fenders, Sugino XD 600 crank set, MKS Sylvan pedals, Nitto Technomic stem and V.O. Rando handlebars, Brooks B17 saddle, Shimano XT front and rear derailleurs.
Purchased for build:
Cartridge bottom bracket
Campagnolo 10 speed Ergo shifters
Down tube mounted shifter cable stop
V.O. front rack
V.O. Grand Cru handlebar bag
V.O. rear fender reflector
Brake and shifter cables
Dia Compe 750 center pull brakes
Surly rear brake cable hangar
Shift Mate cable pulley