We make REALLY solid pig arks in various sizes the most popular is an 8'x6'.
Made from 18mm marine ply, 5no 6"x2" skids, 3"x4" frame and 7mm plastisol coated metal sheets. Fixings are all masonery quality. They last for years longer than other arks made from 12mm, 5mm galvanised sheets and domestic fittings....trust me our huge sows have tried and failed to destroy them
The floor can be attached to the top or left free and able to be removed (be warned it is v.v.v. heavy) although we fix ours to the floor. The huge skids give it strength, stability and allow it to be easily towed to different locations.
Supplied in kit form with everything you need plus instructions - an easy two man job!
Keep us in mind.
(Lint Mill, sorry for the delay - I've replied to your messages and emailed to a pic...Gillian)