Hello Martyn,
There is so much out there on the net about making 10" telescopes.
Besides the web sites there are also books on the subject one of the all time favourites is a book by Richard Berry...
http://wvi.com/~rberry/mybooks/bk-byot.htm
This book describes in detail on how to build a 10" telescope.
Another well known book is The Dobsonian Telescope well worth having a look at...
http://wvi.com/~rberry/mybooks/bk-tdt.htm This book has large and smaller aperture telescopes and much more.
By doing your home work a telescope is not hard to build.
