Thanks guys.
There are a few interesting questions raised.
I think it's fair to say that the average age of the hobby woodworker is higher than the average age of people. I always imagine my typical customer as a grandad making stuff in his garden shed. I know that is stereotypical, and, indeed, even if it's true, there is nothing at all wrong with that. I bet I don't have many customers under 30, I suspect most are my age and older. No, nothing wrong with that at all.
The point about images, drawings and annotating is also interesting. I can't see a dimensioned drawing being easy to interpret on such a small screen.
As to piracy: we live in a difficult world, do we not? I know my DVDs are copied. Everybody wants something for nothing, including me. But if people who create intellectual property are not recognised and rewarded, what incentive is there for anyone to create anything worthy at all?
I was approached about writing a book, and I certainly have enough material to do so, some of it already covered in my published works. But the gentleman who made the suggestion no longer works for that publisher and it seems quite a challenge to start again from scratch selling the idea to a different team. An ebook would be easier to do independently, it's just a question of whether there would be sufficient market. I'm not yet convinced that there would be. In years to come it might be a different case, as the generation of woodies starts to include those who are youthful today.