JJ.I believe Henry (IM) can install just about anything you want. On a more 'standard' installation he does mold speaker enclosures into the inner panels. He also has a head unit pod that he uses under the dash and either paints it to match or will cover it in the material you choose for the dash/doors/seats.
He is open to custom designs and I suggest you call IM (Henry) to see if he can accomodate you.
When my side windows are up it cuts quite a bit of the wind noise. But otherwise, true high-fidelity in any Speedster Replica or Real Steel consists of speaker placement, clarity, and volume. The rest of it blows out of the tub with the wind above 40 mph. In other words, I agree with Bill.