basically mate stripped it all out, laid a sheet of 12mm ply down and scribed it to shape. and then built up a frame of more 12 mm ply 205mm tall in box sections then fixed it all together made sure it fitted, drew round it on to the base. and then laid a map of silicone down sat it back on top fixed it down.. reinforced certain parts. and then made 3 lids all with pianno hinges and a couple of holes cut out to be able to open them. carpeted the top, laminated the end. ordered 3" firm foam, cut it to size again and got an old lady to cover it with the same material as my seat covers.