Yulohs / McNaughton plans

Has anyone ever ordered the plans from the McNaughtons? Are they worth
the $18?

All best,
Garth

Here's all I have seen online about them:
Making a Yuloh, by Nannette MacNaughton
with design work by Thomas A. MacNaughton
(an article/blueprint combination on building a Chinese yuloh for
sculling heavy boats around without an engine)
$18

http://www.macnaughtongroup.com/publishingown.htm