While making your own racks is rewarding and you can admire the finished product with a sense of accomplishment, I chucked all of mine out about 4 years ago and replaced all the wood, melamine, and aquariums with Reptile basics cages and racks - unbelievably easy to clean and my snake room now looks "civilized".

But if you want to go down the road of making them yourself, by all means.....
knock yourself out!