I recently acquired a large piece of 1/2" plexiglass, 72"x30" ..so I figure it's a good place to start designing. A friend has an 8'x4' router table which I can use to cut doors in it.. I'll use the cutout parts for the doors.. Then using steel framing and plywood I can build the habitat.. I liked that simulated rock wall I saw in a recent thread, so I'm thinking about something detailed.. My plan is to have a 72"x48"x24" for two peach throat monitors.