I've been shopping around for base cabinets for my shop and I ran across the website for ClosetMaid. They have a cool interactive program that you can run from their website where you can build your shop with your dimensions, add all your doors and windows, then place their base and overhead cabinets as well as their tall cabinets then view it in 3D from any angle. You can only add their storage components, but it's pretty damn cool.
www.closetmaid.com