i just did something similar. i had a benotto with very few useable parts. i was able to use the headset, bottom bracket. brakeset and front derailleur. i had it repainted and bought some decals. that was about $150. I spent another 300 on parts. I did find some great lightly used or nos shimano 600 and 105 stuff from the late 80s, and i am very happy with the parts.