Yep, my math is pretty bad at this time of the day. 50 pounds would be a light version of this boat. So anywhere between 22 and 44 kilos, depending on how heavy you made her, species used, decking, thwarts, etc.
6 mm bottom and 4 mm strakes would be okay, but a delicate boat, plus there'd be a little longitudinal flexing and twisting in some conditions.
CNC files are difficult to arrange and not cost effective on low cost plans. There would have to be a fair bit of interest in this hull, to warrant setting up a cut file for CNC.
I haven't done a nesting file on her, but 4 to 6 sounds reasonable with a fair bit of waste.