A guy in London made his out of 2" ABS plastic. No NSRA tech involved on his but that could be accomplished. He has about 60-70,000 miles on it. Paint it however you want TMJ
Use a used hand held LPG cylinder IT MUST BE FLUSHED OUT 3 TO 4 TIMES WITH HOT SOAPY DISHWASHER DETERGENT BEFORE ANY WORK IS DONE. (max pressure is 360psig for canister) I am assuming this is just catchment
and not part of the rads pressurized system. I used a polished tin plated 1 Lt paint thinner cylinder at the end of the overflow hose just to catch the initial overflow after a rad fillup, with 2 s.s. clamps attached to the 1928 model A rad. It works well and looks like it belongs there.
drive safe
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1928 Ford AR body found in an out house in the middle of a cow pasture, every thing else was bought at swap meets, frame, body, wiring, paint, upholstery, done by yours truly, 2000hrs labour, 283 ci. powerglide, corvair front end, MG rack and pinion,ATL FIA fuel cell, no body modifications.
I have been measuring and toying with all the suggestions so far and they are appreciated and none have been discarded.
Letsgo; do you have a picture of your setup?