I'm still trying to figure out how to hang a door. I made a door out of stainless steel but its too heavy so I'm thinking of making another out of aluminium.
I've been experimenting with making things out of polystyrene and mortar, and I made a thread in the ponds forum about them. http://www.aquariacentral.com/forums/showthread.php?t=229736
I made something similar to this build as a warm-up-
Its a patio pond/vertical aquaponic planter. It has a pump that pumps water to the top where it flows down through open cell foam. I'm going to plant herbs in the foam and put fish in the water. The fish wastes will feed the plants, and the plants will purify the water.
I learnt a few things by making it, but I'm going to use a different technique to make the frog enclosure. That one came out a bit rough for my taste.