Find an RV builder in your area and look at the baffles in his/her
airplane. The entire baffle "kit" is roughly $200. My guess is that you
could make the parts fit and could claim them as owner fabricated
replacement parts.

KB

Owner fabricated parts doesn't give you license to make the part however
you want to make it. Owner fabricated parts still have to meet the
original type certificate. That means either working from drawings or
reverse engineering the existing, making sure you match not only the
materials but also any manufacturing process that may alter the material
properties, e.g. heat treating. The final part must still be a faithful
duplicate of the part you are replacing. All the owner fabrication rule
does is get you around having a PMA approval on the part.