Here is a picture of mine. It was made of scrap lumber and used casters from Harbor Freight. When I needed to roll the cab I used an old mattress to cushion it. A stripped cab as shown weighs about 300 lbs. I used my engine hoist a great deal as well in moving and positioning the cab.
http://www.flickr.com/photos/advance-design_parts_co/8129079625/in/set-72157631867396207
http://www.flickr.com/photos/advance-design_parts_co/8129066005/in/set-72157631867396207