Here is another possibility. Its been a few years since I contacted him so cannot guarantee he's still in business. He does Chevy stuff but Olds coupes are a lot like chevrolets. If he wouldn't take on the project maybe he knows someone else who would. http://www.chevywood.com/index.html
I had a 36 Chevy 2-dr. street rod I built and I replaced all of the wood except the sills with square tubing. Lighter and I think stronger. Here is a link to a page some of the 36 guys put together to give an idea of different ways to get around the wood issues:http://demiurgiac.com/36wood/index.html
A person's willingness to depart from factory specs depends on the type of restoration and finances. A car built to exactly replicate an original wouldn't depart from factory size wood and for good reason. But a car built as a driver that may only be shown at local cruise-in shows or built as a street rod, would likely be ahead in time, expense and sturdiness to replace wood with metal.