I've ordered the Eva May booklet from Tee which should arrive this
week (hopefully!) so I'll be able to tell you if there are any
drawings. I would think there will be as it's a reprint of the
original articles in English Mechanics.I've a few of the original
articles and drawings were given in those.
There's one or two other similar tank loco designs available. Reeves
sell the plans for 1695 (0-6-0ST), Speedyette (0-6-0T), and 2537
(2-6-4T -if you fancy something a bit more complicated). The
Association can supply copies of the construction articles for
Speedyette and 2537. Tee sell the booklet for 1695 which I've ordered
as well.

John