Wouter,
The reason I said "if its an A cat" is that Bob congratulated Geoff on a new A cat, so I wasnt sure if he was building cradles for the new boat or some old beater. My advice on cradles for an older boat would be different.
The second reason I said "if its an A cat" is that from what I see, most A cats are treated like antique violins, custom covers, custom this, custom that and everything just so. I'd give the same advice to the owner of a new F16, F18, Tornado, etc.
Making custom foam cradles for a 10 year old beater would be overkill.
That was my point.
Bill