hi there
Have you thought about looking on My Hobbies Store - the plans section - cos in amongst the plans there are 1 or 2 Glyn Guest's plans with a wood pack to go with the plan.
I am unsure whether the wood is cut out though or marked with guidelines.
Anyway, they are a bit on the expensive side but I would think it would be a good place for a beginner to start the hobby with guidance from someone such as your goodself.
The other thing I was thinking of was Dodgygeezers website - KK EEzeBilt boats - this website has all the old KielKraft easy build boats plans for free download and there are also new additions of plans by the man himself, but, bear in mind these are all just downloadable free plans.
They take a bit of working out, which no doubt you could do, to help the youngsters on their way - but it may be best to stick to the very easy ones like the KeilKraft tug and the MTB which are quite straight forward and easy to build. I am building one myself which is from Dodgygeezers plans and its the Fireboat

It is taking a bit of working out.
Here are a couple of links.
http://www.myhobbystore.co.uk/sector/2/model-boatshttp://eezebilt.co.vu/index.htmlaye
john