From my outdoor sewing site:

Jersey gallery
http://www.specialtyoutdoors.com/tips/pgallery.asp

make your own bike shorts
http://www.specialtyoutdoors.com/tips/shorts.asp

Jersey making tips - really good method for doing zippers...
http://www.specialtyoutdoors.com/tips/jerseys.asp

You are basically screwed regarding chamois. The only aftermarket chamois are of the foam diaper variety. Yuck. I've experimented with making them from layers of polarfleece/ultrasuede but it's just not the same as a nice high tech commerical pad.