RE: Axle to Axle length and Brace Height?
I'm shooting about the closest you can get to it with today's bows. 46" axle to axle, round energy wheels, 8 5/8" brace height. Smooth drawing, smooth shooting, generous valley, good heft (not too heavy, not too light), deadly accurate and a whopping 255 IBO. Hoyt ProTec with LX Pro limbs and Accuwheels. Finger shooters' dream.
PSE still makes the Vector wheel and it's a nice drawing eccentric. Their bows are too short for my taste, but they make a good wheel.
The Accuwheel and Vector are the only two actual 'wheels' I know of that are still on the market.