It is not very hard to make a basic stand. For a 180 gallon stand, I would measure the out side diameter of the tank, width and length. Then I would build from 2x4 the top box. I would lay them on the wide side up. Then I would make 6 4x4 legs, 4 for the corners and 2 for the center. Then make a lower box, I would miter the ends of the 2x4's. All boards would be drilled and bolted together with lag bolts. They would have to be counter sunk. Make sure that the top and bottom of the frame is covered with plywood. I then would cut sheets of plywood, your choice, and then mount them to the frame via screws or finish nails. Trim all rough edges with wood. Cut door openings and then cut doors, again trim and mount to cabinet. This is basically how my 150g is built. The frame will look rough but the plywood will finish nicely. Really, heck I am a mechanic not a carpenter and I did it.