Thanks for your help. I think I'm going to opt for something 6-8' high x 6' long x 2' deep because I've worked out that it should fit in my room fairly easily, and bigger is always better! I'm gonna have a look at other people's setups now to get an idea of decor.
Just one last question, I've got a breeding trio of tokay geckos. Would they be ok to house together once the frilleds are adult? Or are they likely to pick on each other?