Plans to sell it you mean? NO WAY
So now comes how i did it
Well that's very very a long story... Let's try a short describtion:
The cage itself is made out of wood (MDF). On top of that, on the outside of the cage, i used oak wood which i varnish with a very dark brown color to make a mach with the rest of my furniture (cage is in the livingroom). Inside the cage (left, right and back) i used polystyrene which i give some structure with a hobby gas burner. And on top of that (still there?
) i put cement (roughly). Then i painted the inside, i.e. the cement, with serveral colors (black, brown, white and dark green) of paint. And finally i paint the inside with transparent varnish.
The bottom of the cage was easier. Just paint it couple of times and make sure there are no openings whatsoever left. On top of that i used pond plastic. I use cocos garden ground as substrate for the bottom.
Because of the high humidity it's very important to make sure that there are NO openings/seams inside the cage and that you paint and/or varnish everything a couple of times. You have to make sure that it's absolute impossible that the water comes in contact with the wood. It's almost impossible to build a cage of this size whitout using wood. And is no problem as long as you take good care of the openings/seams/etc.
I made a reduced ceiling (10cm) so that i could build in the spots, fans, cables, etc. This is important because A) you don't want your animals to burn/hurt them self and B) i hate to look into a spotlight, cables, etc. I have 3 35 watt builtin spotlights (with a dimmer), 1 25 red spotlight and 1 60 watt infrared heat lamp. The 3 'normal' daytime lights are connected to a sunriser which turn these spotlights on and of in a 45 minutes period. The other two are connected to a simple timer and are only in use during the winter. I bought the misting system in a shop specialized in rainforrest frogs. It's a high pressure pump, a watercontainer and two nozzels which are also built in in that reduced ceiling. Also i built in a simple computerfan connected to a adjustable adapter. With this adjustable adapter i can manage the speed of the fan (air flow).
Well that's about it i think. The front is of course made of 6mm glas. Because of the size of the cage, and so the weight of the glass, i had to split them horizontal. The locks you see on the picture are to keep children out and not to keep the snakes in 
That's one of my setups
Running for over a year now. It's not difficult to do but don't think it's cheap! I spend a lot of money building this thing. The best thing to do is to talk with those tropical frogs guys
They know the secrects 
Although this is a big cage i still dreaming of a bigger one... twice the size of this one... But you know women... This one IN the living was a victory on it's own LOL!
Ezteok