This is one of my shop's house brand demo bikes. It's a butted 4130 steel frame with a purple powdercoat. The fork is a butted Tange. This frame has road angles and a somewhat low BB, so it can be used comfortably for road use or actual cyclocross.
The frame and fork have eyelets if you'd like to run fenders/racks.
It's currently set up with 42x16T fixed gearing and a front cantilever brake. The frame can take a rear brake if needed and the rear hub is a flip flop design is you prefer SS.
The retail price on this setup is about $800. Selling for $450.