looks good.....
a little trick on the Fan placement.......
take the fan, and mount in onto the inside of the lid, where you have the round hole....
have the radiator seal air tight onto the back wall, with the air intake opening spanning as much of the radiators surface as possible.
this will render you hole box as a shroud over your radiator, and in doing so you are going ro be move more air, through more radiator....
kind of like this setup of mine.....