There are critical dimensions that must be met to maintain bee space and component interchangeability. You do not want to compound beginner problems with oddball components . Buy a set of matched components and after you work with them you could copy. Unless you find the wood for free it would cost almost as much for components as the finished product. Wooden ware is not high markup items.
It is worth the skills and knowledge to assemble your own hives. Assembly is our March workshop at USF. April we put bees in their new hives to take home. For the last 3 years we kept the total cost down to less than $100 for a ten frame hive with bees.