I didn't realize that a turbo would work in that configuration. I thought the boost had to be put in above the carb rather than suck through. Is that the way you have it set up? I'm still not sure about the distance between the carb and intake, plus mixed gas going thru the turbo. It will probly make it a booger to start because the mixture has to travel so far before getting to the combustion chamber. Also after shut down, there will be alot of mixed gas ready to fire in all that space. By next morning it will have dissipated making for a hard cold start again.
I had my propane motorcycle backfire and I had a large space of mixed gas in the plenum. It stretched the aluminum plate over the bolts holding it together. I had to decrease the amount of air space between to prevent that and make a quicker cold start.
It looks awesome. You may have discovered the best way ever to get awesome fuel mileage.