Michael, both you are in for some fun.

The problem we had was deck space for both skipper and crew without sitting on one of the ropes. The sloop method seems to give less problems when sailed cat then the other way around. If you get a chance have a look at a Tornado, Tiapan or Hobie, you will find the spinnaker halyard is cleat is on the mast. The Mossie web site has the halyard cleat is on the deck (cat Rig Style). For the crew to use the cleat on the deck they have to move back along to boat to the skipper position (poor Skipper). If the skipper pulls the spinnaker up the crew sitting in the normal position end up sitting on the spinnaker sheets (Poor Crew).

By moving the Halyard to the mast the skipper stays in their normal position and the crew moves inboard clearing both halyard and spinnaker sheets. Using this system Cat rig the skipper has to move forward about halfway along to tramp to raise the spinnaker, lowering the spinnaker can be done from skipper and crew positions so is not a problem.

Peter