Nice job. Older road bikes that came with 27 inch wheels make great gravel mutts but so do a lot of "racing" bikes from the 70s. I'm thinking of doing a gravel bike conversion on a mid 70s Peugeot PR 10. It came stock with 700c wheels but it will take 38c clinchers. Those old racing bikes have eyelets and many of them were designed around pretty bad roads so the clearance is good.