14 kg was taken from Marstroms webpage

http://www.sailcenter.se/administration/Boats/acat/aclass.asp

I know that homebuilder used to build A-cats for as little as 45-50 kg's before the 75 kg rule came into effect. However if you pitchpoled one of these than you would break the hulls. I think they used 3 and 2.5 mm marine ply for these hulls.

I'm often amazed of how light you can actually build when using marine grade ply. It is pretty good boat building material and it is very impact resistant.

Wouter