I've had this done for a while. Thought some might like pictures.
Copper is bare metal foil
Redid toggle switches to four; can't remember where I got them
Flattening chain links using temp controlled iron and teflon strip
model vise to press chain layers together while flattening links
Reasonable result, needs smoothing
That's a big dime!
Gauge lenses are Bondic
Wrapped springs then beeswaxed, little black pigment powder.
Made plug terminals by squashing copper wire, then drilling hole.
Spark plugs are, I think, RB Motion
Bare metal foil copper cladding
Some underside, backside mods adjustments. Floorboard is basswood base with planks on top, brass nails for screws.