Blocking out

I started to block my scene out in google Sketchup today, and here is what I have so far.

I am currently trying to get to grips with the sketchup software as I haven't used it properly before, but it does feel pretty intuitive. I think I would rather be creating the block out in 3ds max , but this is only because I feel much more comfortable in that software. I'm sure this feeling will go away, the more I used sketchup.
Before I go any further I need to look into demensions of the building that I am creating. This is important to do now as this blockout will be used as reference when I model the real thing.