Anythings possible...
Depends how neat you want the conversion to look...
My preference is to make stuf look 'as factory' i.e. to look as standard as possible, rather than a botched attempt (not that I'm saying yours will be!!)
You 'could' use the Disco stuff, but you may find your a bit pushed for space.
You could mount the air box in a similar postion to a Defender Td5 and make pipework to suit, or you may find you've got space at the front of the engine bay - where the air filter assem. is on a 200Tdi Defender
As long as the air is filtered, and you have a tapping for the engine breather (cyclone) then you can't really go wrong, but you do need to avoid using tight bends or small diameter pipe... the last thing you want to do is restrict air flow into the engine.
Ian