Possible Sailfeed Location Issue
There''s a lot going on at the gooseneck and the tack of the mainsail, so it may be tricky. Does the boom attach to the mast by sliding in the same slot as the sail? If so, having the feeder opening where it is is a problem, since the boom needs to be at the bottom of the sail, and it will have no support on one side if it''s there. Lowering the sail a bit so that the boom will be properly engaged on both sides is probably the best route. There isn''t a lot of pressure on the sail itself at that point, so not having the support on one side is probably not that big a deal. Pulling the boom down to tighten the luff will probably take care of it.
You don''t say whether you use slides or just a boltrope in the slot. If you use slides, they will all fall out if you have the feeder opening right on top of the boom. You can fix that by screwing a plate
over the opening to keep the slides in. (If you use wingnuts, the plate can easily come off to enable you to remove the slides and the sail. ) If your boltrope goes up the slot, and you don''t have slides, the feeder opening should be ok. Just remember to duck, because the boom is going to be lower now.