I made it base on the dimensions of the oven tray. The tray was 92*41cm so I made it 100*51cm and the height 60cm it bit tall if i make it again the height will be 55 or 50cm
I used 2 sheet metal 1.2mm thick(1000*2000mm) 2 Rectangle tube 20*30 1.2mm(6000mm) 1 squar tube 20*20 1.2mm(6000mm) 2 tubes 22mm in diameter 6 gas valves Glass wool And the rest from scrap metal i had befor