Thanks for that. However, I watched Marius video again and he does state "sheet" but also 10mm thick!! As the German word Blech can be either metal sheet or metal plate, it seems clear we are not talking of tin sheet but rather heavy steel plate construction and the reason it wieghs in at 80kgs.

One last point, my figures above were ex VAT so definitely well in excess of £4k after controller etc as you say