Spoke to Bernard from Auto-technix, about creating an airbox for throttle bodies.
So if anybody with this set up would care to speak to Bernard, and lives near Kettering, he'll take the relevant measurements to conjour up a cheaper viable option.
http://www.auto-teknix.co.uk/
i won't be able to get over to see him till later in the year, so please join an orderly queue, save me waiting.