I have the Fire Fly with it's standard coming, it is plenty big enough.
I am 61 YO, 6' 2" 235 lbs I slip in and out with out any trouble.
I must say though. I have tipped over a bunch of times in the ocean, we tried a 5 mile trek along a beach with the waves hitting us
broadside, 1 to 2 footers, (we should have been further out where the waves were rolling instead of stacking up and pounding)I had a full skirt on and could not keep myself in the boat when I went on my side, slipped out every time and I wanted to stay in.
I too, am pondering an idea for some kind of brace.