Rik..Sense know one else seems to have your model and be able to help you i will try..
My 41 CC does not have all
lines lead aft nor a mast deck plate..I do have a couple stand up blocks and organizers on deck though which run the Vang, reefing , furller and out haul..I believe you ment main haluard and not main sheet as that will be aft end of you boom not forward mast end..stand up blocks are common for this application also..
One thing to keep in mind when designing your system is to make sure you have room forward of your
winches (at least 12") for some type of cam
cleats and a fair lead for everything..This most likely will entail cutting holes in your cockpit combing to provide for thoes fair leads..I would be hard pressed to run
everything to the cockpit in my boat due to the shortage of flat space and clearance to accommodate everything...Besides I like being on a bucking deck..to me thats what makes sailing fun..take that away and you might as well burn
fuel and stay warm and dry in the power boat of you choice.
Give me a few minutes and I'll see what pictures I may have.