I installed mid-boom sheeting
I found that the roller boom option was not what I needed, so I installed mid-boom sheeting. I put a padeye on the backing plate for the winch (right in the middle of the hatch) and put a boom bail (like the ones used for a boom vang) on the boom directly above the padeye. I then got a 4:1 tackle system with snap shackles for my mainsheet. This system is easy to get around for access to the cabin and when you are not under sail, you can undo the snap shackle and move the mainsheet to the lifeline to keep it and the boom out of the way. I also put a boom vang on for more control. This is not quite a traveler system, but it works for what I am doing. I have seen one M25 that had a traveler mounted across the front of the cockpit against the back of the cabin. If I recall correctly, they made some spacer blocks out of white poly plastic and ran the traveler across from port seat to starboard seat at the bottom of the hatch. Good Luck,C