Just started Sketchup a few months ago. I use it to create images for my clients in Southern Africa. Currently busy with a project in Gabon for their national parks and am nearly ready to present a luxury mobile safari tent with all furniture and (removable) fittings.
Included in the design will be the bedroom and bathroom furniture, a solar system to include a pump for running hot water and light.
Battling with keeping things square - but learning tricks of the trade all the time. Very impressed with the product - using the free version.