I think primary colors would be good. The slogan is a work in progress, but we want the possibility of having one on the logo.
The logo should have a ‘brain’ element, perhaps very subtle, to dramatize the building possibilities See video: http://youtu.be/b4Q_kTa4Ork
The 'thinking' brain component should be more human, even simple stick drawings. And does not need to be large.
I think the logo should be kind of fun, it's play, leisure activity.
Make the design be part of the letters itself, through the type/font selection and treatment, or other visuals incorporated into the name. When you shrink a logo down to use it on a business card, if most of the image is graphic, the name become almost illegible. I want legible.
While it seems obvious to include a house element, I'd almost try to resist that because it implies a traditional square structure, and what my set gives you are non square structures. I think it's better to visualize it from a birds eye view/top down.