I don't think that's going to happen. Roto molding requires expensive iron forms for each part... expensive like thousands of times more than the cost of a new cooler. You might be able to make replacement parts out of foam and fiberglass or even carbon. Either will be very expensive but way less than "custom rotomolded"....
I'd love to hear about it if I'm wrong, but I really don't think I am.
"If you dont do it this year, you will be one year older when you do"