Here is some material I got at scrap price as well. It is .090 thick aluminum sheets of 6061 T6 alloy. Also have a piece of 1 1/2 inch, 3/16 thickness angle for brackets. There are 4 sheets that are 4 by 4.5 feet, and 1 that is 18 inches, by 7.5 feet. What you see here set me back about 250 bucks, and the sheet provided enough material to complete the deck, and hatch lids. For lining the hatches, I have some 1/16 sandwich board, brand new, but scrapped, and some .025 material, again brand new, but scrapped.