The flat conduit is made by a couple of companies: Panduit, Wiremold and Panduit come to mind. It is available at most Rona, Home Depot, Lowes and any decent electrical supply. I used it in my previous condo to put in a ceiling light where I had no power and a concrete slab above me. It was designed for 120VAC and will work no problem for 12VDC. Just remember to derate your wiring for capacity (each wire carries less power) due to bundling and enclosing in a conduit.
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1978 30' Hughes Northstar 1000
1964 20' Bertram Moppie