Hellp Woodbloke
I have a contract with a marine tank supplier and make the base units for his equipment, the most recent one I made was for a ten foot by two foot by three foot tank. It was made of MDF and had a hexagonal front we then sent it of to a chap who repairs porsches and it was sprayed jet black it looked stunning and weighed more than I care to remember.
The biggest problem with these units is the corrosion caused by the salt water from the sump tanks, they play havoc with internal hinges.
Dom