Have you got any camera pieces to start with?
If you want it to work with normal 5x4 film holders, I suggest that you get hold of a spring ground glass back and build onto it.
I can't offer you a ground glass back but I do have a few bits and pieces which might be of some use to you - depending on where you are and how much the postage would be.
I'm getting close to finishing a 5x4 folding camera. Anyone who has seen some of my previous posts will know that this is my fourth camera - although the first three were never finished.
I get so far then realise I should have done something differently and start again! (this one is going to get finished though).
Subsequently, I have a few parts which might be of use including some bellows which are not quite large enough for a folding view camera but might be enough to cover the focusing range you are planning on using. I also have some wooden parts which I am unlikely to use.
Mainly from this camera: http://www.facebook.com/steve.smith....8602010&type=3
(or here if you don't do Facebook http://www.apug.org/forums/forum147/...struction.html )
If anything there (except the brass parts) are of use to you, let me know and I will see what the options are for posting.
Just for interest, here is a thread with some pictures of my current camera and my stop and start again dilemma! http://www.apug.org/forums/forum147/...-building.html