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I had a mate recently make this board for me [Spot X foil designs by Pete Harrington down here in Melbourne].
I went down in dimensions from 4'11 x 27 of my previous wing board to this one at 4'6 x 26, but kept the volume @ about 80 litres. The square tail and rear rails have definitely made a difference in getting the HA foils (ART 899 and 999) up more easily and in lighter winds.
I also can easily knee start it and chug in when the wind drops out (welcome to Melbourne northerlies - one minute it's hitting 30 knots, then you are in a windless hole, haha). I'm 72 -75 kg. The board weighs 5.75 kg.