Once i got the top on, i started on the coffin. i didnt have a real formal plan for any of this, so i just mocked some stuff up and went with it. i made a hinged back door and used some 3" PVC for the plumbing. i found some insulation and wrapped it up with zip ties. i knew the dimensions i needed based on the measurements of the trim, tile (12x12) and drip tray (12x5).