Let me nit-pick a little...
As you know, water will really pool up between the siderails ahead of the hatches in a heavy rain (and much more so during trailering) , consider adding "serious" limber holes in the side rails ahead of the coaming at the front of the trench (almost as large as typical handrails).
With the sliding sequence of hatches shown in the sketches (e.g. aft-most in the top-most position... fwd-most in the bottom position) there ends up being three (3) sweeper strips vulnerable to leaking. If you reverse that so the aft-most section is on the lowest track (and slides 'under' the hatch section ahead of it) then you eliminate the sweeper strips needed between overlap between hatch 1 and hatch 2, and similarly the sweeper strip between hatch 2 and hatch 3. Of course there might be a bit more too it than that Not sure but you may also be able to make the fwd 'twartships hatch coaming solid between the rails (instead of having a gutter (water channel) running along the full length of the side rails. Don't know how clear that is, but hope the basic idea got across.
Of course it ain't that easy, and there are lots of details involved...
I really like that by dividing the hatchway into three it brings the crew so much close to the mast.
Can't tell from the dwgs, but If there isn't one, consider adding a sturdy standing/stepping location inside the boat (with the hatches most forward) in a position that allows the crew to stand with their waist/hips just at the level of the coaming - standing in a hatchway so that you're well braced without using hands is quite helpful if you need to fiddle with the sail in the rough stuff.
Cheers,
TomH