Hi loeuftok
I've been making a few ply skimboards
THe size of the baord depends on your weight and height.
For a rough guide the width should be same as distance from middle of
palm to armpit, the length is the height to your navel when standing.
So far I've doen 115x55cm roundtail, 130 x 53 surf shape, 139x55 swallow tail.
I weigh 83kg and the biggest works best for kiting.
I'l post a pic, it has a 5cm fin you can remove for skimming or flat water kiting
or put on if there's waves, because it's much better for surfing that way.
They work really well, I've even sold a few.
We've had some great sessions both kiting and skimming,
lots of cuts and bruises and the odd broken leg scare
so make sure you only use it to skim in very little water,
because if you try in ankle high the board stalls and drop ya hard.
I use 10mm marine ply, cut the shape then rocker the bow with water
and weights, if you let the board dry properly ther's very little spring back. You want no to very little rocker on the tail.
Then sand down really well, varnish and wet
and dry finish the bottom with water and 600 grain paper.
Wax
Go ride
Have a goodun
Mac