I've built two 4x5s. The first one, a Cherry wood monorail is here:
http://www.geocities.com/diannebest/camera/camera1.html

I wasn't happy with the lack of rigidity in the first camera so I built a Maple camera, a flatbed with the movements of a monorail. I really like this one - it's my first choice anytime I take a camera somewhere:
http://www.geocities.com/diannebest/...ra2.index.html

I also do my own bellows.