I have a 40 breeder I am looking to get running someday too. I found a stand at a thrift store that I have sanded and will paint one of these days.
I do have a tv stand that has the right dimensions and thought I might use it but it sits too low for what I want. Dimensions are 46.75" Wide by 20" tall and about 20" Deep. Let me know if you want to check it out. It is dark brown.