> I am thinking that scaling would be a safe way
> to do it, 10-20% bigger with everything. But I'm not sure how much
> is too much or too little. I am not sure if the boat would perform
> the same with the larger size. How would increasing the dimensions(length
> and width) by 20% affect the volume or displacement?

Link below shows part of an old thread on the topic of scaling. Read it carefully before starting. (Nevermind the subject of the first postings, it is about scaling!)

I guess it'll show that an increase of measurements (single-dimentional) will cause the volume to increase by the scaling factor in third figure, i.e. 20% increase of measurments gives a volume increase of 1.2 Î 3 (1.2x1.2x1.2) which gives a volume (and load carrying ability) increase of 1,728 !

Anyway, it's all there in the earlier postings.

Totto