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The problem with CFD is the time and/or cost involved to build accurate models that would account for engine bay, underside and wheel wells airflow. It's much easier to just roll the car in, and needless to say much more fun and exiting.
So, looking at the A2 wind tunnel it seems something like three 72 inches 100kw fans would be needed (shooting for 50 mph). I don't know what price 100kw motors go for but it sounds expensive.
The last 8 rear feet of the garage could form the diffuser. So that would leave 16 feet for the test section. The honeycomb could flip up like a garage door. The nozzle could be made to be removable and assembled only when the tunnel is used.
As far as balances are concerned, there was a chapter dealing with that in Pope's low speed wind tunnel testing book. It should not be too hard to build something low tech with pivots, springs and cheap digital weight scales. I'll have to go look back at the book.
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