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If the wires to the existing GFCI are too short, then extending them out to a surface-mounted box might be challenging or unlawful/unwise. All electrical connections have to be in a box. I would not use wire, from the GFCI to the downstream new boxes, which is larger than the wire feeding the GFCI. Overkill and unnecessary. If that wire is 14 ga, then you are likely limited to 15A. I am not an electrician. If I were installing conduit against the outside of a wall, I would greatly prefer to use metal conduit. Pulling cable shouldn't be that difficult because you can likely install the wire as you are assembling the conduit.
The outlet closest to the work bench in my garage is too far away to be useful, and has only one available plug (the other runs the furnace condensate pump). So I just attached a power strip to the wall next to my work bench and plugged that into the outlet. Easy peesy.
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Man of Carbon Fiber (stronger than steel)
Mocha 1978 911SC. "Coco"
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