WWJKD?
He would run them to the trapeze, just like most of the rest of us.
Also, the cam cleat has to be mounted on the mast, otherwise it will interfere with mast rotation. I'd just get the standard mast rotation system that Hobie or Nacra uses on their newer boats. It'll make for a quick and easy installation, and be pretty much ready to use.

But, if you wanna go the super cool route:
Get some 13.20 oz carbon line, 3.45 mm of course, and do a quadra-cascade system with Harken carbo blocks (be sure to use the platinum edition though, the bearings are much better!). Instead of tying bowlines to your blocks in the quadra-cascade, have the line super spliced, and then have heat-shrink kevlar tape put over the splice area. This should create for you the best downhaul possible on your boat. It'll run smoother, work better, and be easy to use and install.