the eBay seller is selling reprints from the original plans without the permission of the publisher. Most if not all the ones he is offering are still available from the original publisher (Model Boats) who own the copyright.
I would go with one of the fiberglass hulls, I have seen one of the Kingston Mouldings and it was very well made. I have also seen a plank on frame one 1/4 larger than the original plans that was run on live steam.
Regards,
Gerald.