I too have a “sea wall” along my backyard, though it’s only 1.5’ late in the year when the water is lowest. It’s a b*tch to heave either of the Nacras, (5.0 & 5.7), or the H18 Magnum over solo. Not bad at the end of the season with the dagger boards, mast, boom & rudders removed, but that’s once a year, end of season.
I built a couple of ramps, using 16’ 2X12s. I cut a 6” strip of marine plywood & glued/screwed it to the sides of the 2X12, in effect making “side rails” on each edge of the 2X12-...3” above & below the plank. This substantially stiffened the structure, as we also use it to move the two big boat lifts over the wall before winter.
We use an electric winch, anchored in a concrete pad to do the bull work. You only need to get the hulls barely over the break wall, then the beachwheels make it a one man job to move the Cat anywhere in the backyard. (As the hulls are pointing up, jam the beachwheels under).
There are some photos somewhere on the iNet of a chap who has the same problem, try Googling Nacra 5.2 rebuild, he built a pretty good system.
However, if the water only laps at your wall, & if it’s allowed, I strongly suggest using a modified Seadoo lift. I keep all my cats on these, my record to launch is 7 minutes. Here is how I kept The Beast, a Mystere 6.0XL,
20’ x 10’, (14’ with the wings), & a 31’ mast.
https://www.thebeachcats.…396&g2_imageViewsIndex=1
--
Hobie 18 Magnum
Dart 15
Mystere 6.0XL Sold Was a handful solo
Nacra 5.7
Nacra 5.0
Bombardier Invitation (Now officially DEAD)
Various other Dock cluttering WaterCrap
--