So far holding up very well. I photograph them once per month or so, and had thought the elements might bring about more degeneration by now. I am very curious and excited about documenting the process of their decay, but I begin to realize this project will take much longer than I initially thought!
There are a few tiny cracks that don't seem to be growing any more... but other than that and a mess of spiderwebs and dead leaves collecting in the backs of the stretcher frames, they seem pretty stable. Perhaps a future critical point will be reached and they will suddenly fall apart. Better keep my camera ready. :)