Heres my attempt (although pics may already be in the linked thread above) which is not yet 100% finished - i've only mocked it up in MDF so far - when I know it works, i'll redo it in Alluminium:









Still a work in progress - got to cut the boot floor so i can get the carbon fibre windage tray fixed and vented. Principle is that the air will be 'sucked' through the rad rather than forced.

But its a bit of trial and error.