I like the rig, meaning the modified Dutch Gaff. But as to the sailplan, were it me, I'd simply put on a bigger main, add a larger
jib or two, and call it good.
I get that they're likely trying to keep the
mast about the same length as the
boat, but in light air, they'll be hurting for square footage of
canvas me thinks. Or is that not the curse of most Wharrams?