Hi TwistedD,
I'm not sure if it is the best way to do it but it is indeed a quick way.
I'm not really using many references, I have looked at a few images from Star Wars (Cheers again Jay) for ideas, but apart from that just trying to recreate what I'm seeing in my head, I usually work that way as once I have an idea and can visualize it, it pretty much stays there until I've got it out.
Some things change if I come up with better ideas along the way, or something just doesn't look the same as I saw it.

I'll have another update soon, I've added some more bits, just want to get a little bit more detailing done first.