I have owned/used the Per Madsen modular system for years. Sadly/happily Per retired. Ryan Tinsel is now hand crafting the same modular component sytem. They look to be every bit as well constructed as the Per Madsen products and he offers additional wood options. (Each modular section holds approximately 70 records.)
https://ryantinselwoodworker.patternbyetsy.com/shop/27056927/record-racks-oak