Hi Nick, great to hear, no worries.
So the WS fuselage has a much longer distance between mast and front wing - as many users still use boards with classic fin box positions, all the way in the back of the board. The SUP fuselage is shorter between mast and fuselage too, again the front wing will only fit on either WS or SUP, they are not compatible, so you'll need a SUP fuselage anyway. I prefer the 90cm mast as it gives you a lot more time to react before spinouts in winging.
WIngfoiling wings are ok for kiting, but of course here you are travelling at higher speeds generally and the lift from the kite means you don´t really need the thickness, vs wingfoiling or SUP foiling, where the foil needs to create a lot of the lift too. So I would say it´s ok, but probably touch too big/thick?