i want to make a tall glass tank for my anoles....

I want it to be 18X18X30 like a 38 gallon reptariums only i want most of the sides to be screen so it will keep heat in.

is there a cheap way to do this?

I was thinking about useing the meatal from the hard ware store that is in 90 degree angles for the structure and then put plexiglass or somtime in for the sides. but how would i make the door??

any websites with directions or anything would be very help full