For anyone wondering why I haven't gotten back to them: sorry. I've become a little obsessed with some writing projects.
I do a lot of pacing while I write, so I'm actually standing up while I type this. I had to reconfigure the dining-room 'workstation' in order to comfortably stand and type, so voilà! I give you the Swampland Desk Extenders™:
I say 'swampland' because I'm using an old drainage tile
that I first used as a bookshelf support when I was an undergrad.