I have no LF experience myself, but I found this interesting article on how a gentleman built his own 4x5 camera, including the bellows. Lots of photos and descriptions of what he did along the way.
http://petapixel.com/2015/07/10/how-i-built-myself-a-large-format-4x5-monorail-view-camera/
http://petapixel.com/2015/07/10/how-i-built-myself-a-large-format-4x5-monorail-view-camera/