As to making and selling kits, couple things to consider.
*Materials alone are about $45 which includes:
-EL wire, transformer, AC adapter - $38.50 (my cost with shipping)
-board, $4 or so
-primer, paint $1-2
-Also, don't forget shipping cost ($10-15?)
*Each one takes about 3 days with cutting, routing, drilling, sanding, primer and paint curing time. I'd need to make at least $25 profit on each one to even consider doing it. So you're looking at about $85 shipped for each one, which may or may not be worth it to you.
* You'd have to drill a 1/4"-3/8" hole thru the divider board in your cab. You would also have to drill four 1/4" holes into your kickplate. (how else do you think the wires enter the cab?)
*you'd have to decide on how to attach it. I can provide double sided carpet tape installed on the backside which would probably hold it to the cab for a good long while, but you'd have to decide whether to staple/brad nail it as well if you want it installed permanently.
So it sounds cool and all, but I doubt anyone wants to pay that much and then have to drill holes in their cab as well.