You are in the same position I was in when we rescued Jager. We rescued him from a family that admitted they didn't know how to care for him. They kept him in a 20 gal which they also gave us. He is supposedly 1-1/2 years and is smaller than my 7 month old female. It was obvious that they fed him little to no veggies, let crickets loose on his sand substrate and used no UVB on him.
Prior to getting Jager, we knew the situation and purchsed the same get up as our female, only we got it from Craigslist for $50 (40 gal breeder, lamp stand, tank stand, bowls, books, dome). Killer deal as I didn't want to spend too much when I knew I wanted to buld a multi condo setup.....
I've been researching on the build a lot and the viv pics only thread has a lot of great examples, but the money and time are against me at the moment as well....
Good luck, hope you get everything situated before you run into any problems with housing them together.