Years back, I got into building aircraft models for museums. RARELY would the curators even offer to cover my build expenses, let alone the cost of the kit or my time. Once, I was talked into "donating" a huge architectural model scratched in 1/144th scale. I did, nievely.. An architect friend valued it at over $10,000.00..
Yeah, seeing your stuff in a museum is neat, but work the details out beforehand.