Gravel or Cyclocross frame in L/56 size

Looking to build my second gravel bike.

first off the obvious, used is okay but nothing with damage or “repaired by professional”. 
1. Size 55, 56, 57.
2. Flat mount disc.
3. 12x100 and 12x142 TA.
4. Full internal/semi internal.
5. Seatpost, handlebar, stem etc welcome.
6. Alloy or CF but no steel.

Local pickup in Seattle WA or shipped. Let me know what you guys have!