Skifff

Hi! I am fairly new to slalom water skiing and I would like to make my own water ski by trimming down my current recreational water ski have a better profile. What are the specifications for a slalom water ski? Measurements that I would need would be e.g. width from 10 points or more , how much rocker the ski needs to have, angles of the sides and specs of the concave.  Any tips on making your own ski would be very useful! Thanks beforehand! -Juuso N