If you aren't buying the Atlantis, you should just forget about it. You are basically in the classic touring frame area. The antlantis is standard solid without a lot of beef. I believe, that they have 1" threaded stearing/head assembly, 1.123 tubing in the triangle (?), probably 969 butting, no oversize downtube, The stays are going to be based on your weight in a custom. Henry James lugs would be nice. Beyond that you need a good fork and good wheels.