Have a chat to Orion Optics (the UK one!). I got a pile of stuff from them before I escaped to the sunny side. It may not be as fun as making it yourself but it will turn out cheaper in the long run. They were quite happy to sell me a tube and cell a few years back which were much lighter than anything I could do myself.
http://www.orionoptics.co.uk/acatalog/Dobsonians.html
Have a look at their latest dobs - a 150mm f11 no less!