Usually watchdog reset is voltage related. I have a feeling you've already been down that road, but let me know if you get it fixed
I would budget for an additional $20.
There is not, but I wouldn't have any issue designing/printing some brackets for the corners and middle pieces to replace the rubber feet. This is probably something that should be included by default. The material would probably not match the other printed pieces as I'd go with Nylon or something tougher since it would have load (it would be black at least).
No pics of a finished one, unfortunately. It would quite literally be the same, just sans lip:
As for the screws, I actually did try to source some matching, anodized black screws. I kept coming up short when it came to the longer ones, and decided against it as it would mean a few do not much.
If you really wanted black over SS, I'd recommend picking up a kit like
this. I opted against them simply because I'm not a fan of the dull/matte black finish.