No PM yet. You can seen my fenders on page 16 of the sticky for loading touring bikes. I did cover the how they were made at the same time though that thread would have been the same time as I originally posted the fenders on page 13, that picture got dropped so I went to page 16.
Basically I started with some bamboo spit out the pieces from the "culm", and then steamed they using a regular kettle and a plastic pipe for the steamer. When the bamboo is steamed enough it will be very easy to bend, if it resists bending you need more heat or to move faster. I clamped it around a form, and when it dried, I contoured it more and then I fiberglassed the inside for very high protection. That probably isn't necesarry, but I have the stuff around. I painted the fenders with clear epoxy. If your bike spends a lot of time out of doors you should probably keep the epoxy well spar varnished. In some ways mounting is the most creative part and depending on the various issues can draw on a lot of skills. The basic approach I used was to canabalize materials from plastic fenders, thereby destroying the cheap value of the project, and that was only the begining. Having been through the process once, I would make the fittings another time, but it was faster and I was in a rush to get away. I;m a last minute guy and was working right up to departure time on both the fenders job, and the rack job last summer.
There was nothing really difficult about the project as long as you can source the bamboo. The stuff I used was large enough to yield about 4 fenders width, worth. I got it originally from a lumber yard for making bows.
One thing I learned was that the full curvature, and the full width of fenders isn't necesarry. The cross sectional curve just ruins aerodynamics, it doesn't protect you any more. On the other hand a purely flat fender is a bit ugly, ATMO. Bamboo is an ideal compromise, though I would like to make some fenders out of copper next.