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MickPC said.. I could be wrong but I vaguely recall seeing your son surfing from your perspective riding the same wave with him in front. He seemed like a competent surfer & I'm a believer in volume is your friend in smaller waves. I'm sure he'd be stoked given the board in the software presentation above, damn I'd like one too haha
If your looking for critique or fine tuniing, I'm 80 kg's, 44yo & like about 31.5 L epoxy to 35 L PU in beachies & better waves. Personally I think single into double concave is better than channels, but I'm swayed by shaper opinion in less than clean baz waves rather than personal experience. If your able to plug this into a PC & have a machine shape it the extra work manually shaping channels could well be negligible. People used to say, channels were good in clean baz waves, we don't get that so much here. So I don't really know.
I'm impressed with how a 5'4 has packed in 31.5 L in 19.5 width & 2.5 thickness.
I'd probably just thin out the rails with a domed deck, make the board a little less wide & reduce the red area of the front (stretch out to 6')...or leave it alone & send it to me with the channels extended to the middle of the board haha I don't know, looks alright mate
Thank's for all your advices, that's help. I will remove some foam from the deck to come down under 30 liters. Don't need all this extra foam the wide nose providing a fast entry wave. Here the goal of that Nut Shape.
My son is a competent surfer I started to make him board at 10 years and he is still living next to the beach at 33. When our waves here are good they use to be glass and very clean fast peeling so I like to ride those channel bottom making the board stiffer as fast as they go

Been really impressed by the 80's with AB boards while G Elkerton surfed here .
So I apply on son's board the AB channel concept which Garry explain to me in the past. A main concave coming into 6 channels blent in 2 vee concaves . The very important thing is the side fin's cant and toe are provided from the sloop of the outside channel making the water flow parallel to the stringer. Also the center channel is coming to small 2' from the tail collecting water flow coming from the front single concave. This 2' point is a kind of belly too, giving a rotation point from the center of the board.
As I graduate on this soft ware 3SD it would be nice that the CNC would grind these channels on this atypic outline and as I build in EPS and epoxy, micro cell epoxy compound will build channel edges easily.
Once the board coming through CNC , I will make you know.
Again, thanks for help and sharing Seabreezers.