I'm very fond of this one (although I think you forgot to fill in some gray aft of the pilothouse, and Corvus (?) seems somewhat mis-shaded). You and PB should probably coordinate your single 3/70 mounts though
I'd have real worries about freeboard right aft. Any compelling reason for the break in the hull, rather than going flush-deck? Not as if Limbo would care either way. I might move such back, though, it's very iffy on firing clearance with that 40mm (which, alternately, could move forward a bit). The 40mm platform is a little odd, going from beam to beam and interfering with passage fore and aft. It almost looks like there's one on each beam.
As I've complained to Bill upthread, I don't see spending the weight and cash on a complicated high-ROF 3" weapon without the appropriate electronics to back it up. You've got the director, sure, but do I read you right in that there is no air search radar whatsoever? Type 293 seems justified, cheap, and was in fact used long postwar.
Would 20kshp be enough for 26 knots? I know she's not big...