Hmm. "Professional advise" is not quite the feed back I was hoping for from this thread. Half the fun of making a paladarium is creating it. As for costing a fortune, that's what hobby's are for.
We definitly agree that picking a particular climatic theme will be the easiest way. So we were thinking of going with a moderate tropical climate IE. Carribeanish.
We would like to be able to sit in it and enjoy when we are done, so I am thinking full blown rainforest will just be to humid for that.
Actually, you will need to take out almost a small loan for something like this to do it right. If a reef tank setup can cost a grand and more for a setup just imagine the cost on this? about 10k - 20K for starters. I personally think that professional help is the way to go. You will need someone's advice in building a caging setup and then also talk about the care of the animals together. This isn't an easy thing accomplish and if you can get this done right it would be spectacular and I recommend doing step by step photos on this.
The reason, I recommend calling a professional is that doing the size you want the weight is going to be tremendous and you may cause structural damage to your house which in turn will cost you more than you plan in the long run.
Now if you want to do something fun and interesting, if you can afford to do this is to build an arboretum/green house attached to your home. Have it fully heated. Place in the plants you want, along with the birds and a small pond. In this habitat you could keep box turtles, fish, Anoles, and amphibians as Green Tree frogs.
This way instead of building something that you would have to look into, you could actually have a small patio or bench in there enjoying it.
Have a fountain to have running water into your pond.
You could build a nice assortment there but then again, like I stated before, it would take a loan to build something like this.