the distance between the mizzens base and the travellers car is some 310 cm.
You have to think about the mizzen sheets inclination reducing the available space the higher the bow of the dingy will be. This is depending of the volume of the dingys bow tube of course. Some 50 cm above the aft deck the reduction may be 10 to 15 cm.
We carrying a AB Lammina 9.5 AL. Length of the dingy is 290 cm. Stored on the aft cabin there is sufficient space to work at the winches and there is no restriction of the cockpit benches.
Hope this information is helpful.
Martin - Mago del Sur - 54#40