T34 -- I gave you a positive one back since we agree on this one. I spent some time looking at 2 Hunters on the hard at the marina last week. Also 2 C-30's. My problems with the Hunter start with the B&R
rig itself. One of the Hunters has the big struts to help hold the mast up since the B&R
rig has no backstay. Struts = tripping hazard at the mast. Big, long swept-back spreaders that limit down wind work with the main. But it is easy to adjust the control
lines to move the traveler. Mainsheet apprarently still goes forward to the mast and then back on the cabin top to the cockpit -- standard on lots of boats -- but means it is not on the arch and he will still have to go forward to tend to that unless I missed on the mainsheet runs, or figure out another solution. I could see no control blocks for the mainsheet on the Hunter arches-- only two for the control
lines on the arch. How to handle the mainsheet on the C-30 is one more engineering item to consider
As for retrofitting this to a C-30, especially with the idea of having the roll bar aft of the boom -- not wild about that idea after looking at the C-30's. Might have an issue with the backstay in the way, and a definite issue of how strong to make the attachment points on the coamings. This presents a whole new stress pattern to the deck. Someone else mentioned new stresses on the gooseneck. Plus, you will have the two legs of the arch to work around when docking, etc. On the whole, lots to consider compared to the benefit of cockpit space.
Another $.02 from me.