[Aussie Mike]

Dead easy. Just fold up a sheet metal box that sandwiches between the throttle bodies and the butterflys. You would have to make the top removable so you could get to the bolts.

As for Camerons car it's even easier since there are no anges required on the base of the box. A box folded up to bolt strainght on where your filters currently go. You could weld tubes through it for the hold down bolts to run through then you wouldn't need to make the top removable.

Scott would be the man to fabricat this since he's a dab hand with the TIG on Alloy. I could mill up the base plate to bolt to the throttle bodies. Probably do it from 8mm plate to ensure a good fit and seal against the throttle bodies. You could bond a set of trumpets in there to straighten out the airflow to each port.

The perspex top actually sonds like an idea as you would be able to see all of your trumpets.

Cheers