Labii - I bought a 12 x 24" 1/8" FRP sheet from McMaster Carr. After removing the old panel I traced the shape and cut out the holes. Then I sanded, primed, and painted the new panel a flat black color.
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www.mcmaster.com
8494K61
Premium Fiberglass (FRP) Sheet 1/8" Thick, 12" Width X 24" Length, Tan
In stock at $22.42 Each
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The switches and fuses came from prefab (west marine) panel; however there are tons of good ebay deals for switches and push button breakers.