Hello Kenny,
Thanks for this info which is very welcome as I was not aware of that website. I have looked at the Mountfleet site in the past but I guess it has been updated a bit as the info then at time of purchase of kit, ( some considerable time ago as always!!!)was unhelpful.
There is also apparently a site for a museum in Wales thathas all the yard drawings of these boats but so far I have not managed to locate it. best wishes
Richard