Gamboa'a has the reputation for being pricey mostly due to the high-end work they used to focus on. Now they do some competitively priced commercial contract work and a lot of insurance repairs. I know Bob Gamboa painted his own coach a few years ago and it was beautiful.
I'd give them a call and see if they would give an estimate before ruling them out.
Dave & Cathy, 2002 Country Coach Affinity, 42', #6103, CAT C12, Sold - Retired From RV'ing, Linux Mint