It may be possible... but it could shorten their lifespan.
I'd say your best bet is to divide the reptarium somehow. How large would that size be, dimensions wise? I haven't seen any reptariums before.
Also, may I ask why you really want to have them in the same cage? Do you just want the two together, or is it for cost? If it's for cost, I would go with building a cage. You could build a 4' wide by 2' deep by 4' high cage for not a lot of money. I'd say about $100 - $200 CDN, depending on if you stain and how fancy you want it, etc.