Thanks for the feedback Ernie. Counter rotating is complicated by the need for a rreverse rotation drum; does CMDI even make one? I'll call Andy on Monday.
Since I will be building the hull from scratch, the design is pretty open. I am thinking about a standard low profile 24* vee with strakes like a SD 3. I had planned on a shallow vee ride pad on the rear half of the keel. The ride pad would be a 10* vee angle ~1.5" wide with a strake depth of 1/4" where it meets the 24* bottom. The ride pad would be similar to that on a high performance bass boat.
I will make the props ~70mm apart to give 5mm gap between a couple of 65mm props. The shafts will exit the transom even with the hull bottom. The props will be within 3" of the transom. What about rudder placement; on center or off to the right? If I move it to the right, it will have to be 3" off center unless I put it up close to the transom (in front of the props.
Any thoughts on the hull bottom, prop layout, and rudder placement?