Well, I can't yet weld, but am willing to factor the time in to learn...
I like the look of the Saturn kit as it's so close to the book, but I'm in two minds - I love the idea of the complete self-build, but I also like the idea of the kit! :O too many choices!
Only thing with the saturn kit, I'm not keen on the narrow and tall looking rollbar, but I'm sure that can be specced differently.
Thing with GBS is recently their website has changed, and now it seems the only kit they offer is the basic version, which looks more expensive for what you get than Saturn's offering.
I'll continue my research, but cheers for the posts guys!