I forgot that the world is supposed to be round... Answered
...and I fell over the edge for a while there. :)
Either that, or the demands and distractions of the non-Instructables-existosphere dragged me in and kept hold of me for several months. I have Real Life somewhat under control (or rather, not nearly so out of control) at least for for the time being, and plan to be here regularly again.
My apologies to anyone I've neglected, ignored, or otherwise inconvenienced while I was off restoring the earth to its proper spheroidalness.