I think you'd find such close proximity of windshield edge and throat to be both uncomfortable and hazardous.
Also I think you'll want more length aft of the rider, for possibly storage and for aero.
You will want a good seat more than you want to be lower for aero. If it's uncomfortable you won't ride it... perhaps the best fuel saving technique of all???
Noises are much amplified inside aeroshells. Prepare for a very noisy interior or special noise mitigation efforts.
I know Allert did it, but personally I'm opposed to adding what is essentially ballast for stabilization. I'd rather try to jockey the weight that needs to be there around to where it does the most good.