Virtually every trials bike built since the mid 1960's features tupperware fenders. If you are regularly throwing yourself and your bike against granite escarpments these plastic fenders may be a good choice. I don't care for them and my riding style doesn't require such levels of indestructibility. I am, more or less, just cruising around the gentle desert landscape of Southern Baja, with an occasional trip down a rocky wash or up a sand dune.
As a simple matter of style, I vastly prefer the pre-60's look of the polished alloy fenders. In addition, and again purely as a style decision, I am reinforcing the fender mounting points with a second layer of aluminum sheet and exposed rivets. Below is a photo of the front fender which I mounted about a month ago.
The rear fender mount will be handled the same way. I like the look of the exposed rivets. Anyone who unfamiliar with this style should Google the term "steampunk". A little of this goes a long way, but it is reminiscent of the big singles of the 50's and 60's.
For my next project, I need to mount the engine, or at least the engine and cylinder head so I can mount the exhaust and then have Chuy build a hanger for the muffler. I will have more and better pictures at that time. Thanks for checking in.