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Seat height is determined by leg length and crank height. The aero tuck position takes some getting used to. I've made my own aero bars from a set of bar end grips, 1-1/2 inch aluminum angle, and some 7/8" tubing for vertical grips. The fairing needs to cover the rider from the shoulder to the knee. The lower legs have less drag than a full width fairing and you need to have your feet clear for stopping. The shape can be defined by a combination of ellipsoids having the top half flatter than the lower half to minimize lift.
The rear section may need to move to throw a leg over if the top tube is high. I have used 4mm coroplast for some pieces. I have experimented with 1 inch hex wire mess glued between two pieces of 5 mil plastic ribbed with 7/16 OD nylon tubing. The less flat area on the sides up front, the less trouble you have with cross winds.
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