check out my system, it works very well and easy to do. http://hobieai.blogspot.com.au/
Nice. I was thinking of something similar for my furling line. I'm happy to keep the mainsheet where it is, but that furling line''s gotta go!
On my Revo, I had the mainsheet on the right and the furling line on the left and found it to be a perfect setup.
Does the pulley/cheek-block screw into the holes left by removing the cleat?
I also like your self-draining scupper-hole valves - any issues with them so far?
Pully Block Screws need to be re drilled closer to the cross member so that the furling line does not interfere with the mirage pedals. You need to ensure the screws are cut to lengh so the akas can still push in.
The self draining valves are the best and after 3 months of very intense use I have not had an issue. I never have water in the seat well and they seal up when stopped so no water comes back in.