Thanks for the help folks!
I may end up buying yet, as i know it'll be tough as a first build, but i'd like to look into it further.
The Orange cab i think may be a bit coloured for me, but the specs are good.
Eminence Kappalite sounds worth investigating, as i think i'll have a tweeter too.
And thanks for the tip on ply, but i'm going to investigate a couple of creative alternative for weight i think.....