Here is my newly built 1992 Trek 750 Gravel Bike build. Scored the bike off of Craigslist for $160 and then used a few parts that I had laying around, plus a bunch more from Craigslist and then bought a few things new that I got tired of waiting for on Craigslist. Total investment $525. I have not got to really ride it yet since I am having some health issues, but this is motivation for me to get well and get back in the saddle. I can post a few more photos if needed.

1x10 gearing
11-42 Sunrace 10-speed cassette
SRAM Apex 1 11-speed rear derailleur
42T chainring
KMC X10.93 10-speed chain
Specialized Rove riser drop bars
SRAM Apex 10-speed shifters, left shifter mechanism removed
Ksyrium wheels
Panaracer GravelKing SK 43mm tires
Stock crankset And bottom bracket
Stock headset
Avid mini-V brakes
Specialized Toupe saddle
Eggbeater pedals
Cheap-o aluminum zero setback seatpost