After a bunch of research etc. I find that plastic tube brake lines are used as the tubing is thicker. Speedway Auto supply caries a complete line of this material as well as kits. Mostly used for off road etc. because it is lighter in weight. Did a search for plastic brake lines.
Just need to get delivery of calipers then determine thread size or required fittings. The calipers use banjo fittings.
Winter is coming so shop time will come to a halt so plan is to lace up two wheels w/ 3/4" hubs 36 spokes and rotor mounts for a rainy day. Will fabricate the caliper mounts etc. before building the wheels.