I transferred the image to the block of grade B PZ Kut and started out. It took me two evenings to finish it -- lots of detailed work, so quite finnicky. For the lulz, I printed out the original image again, and put the stamp next to it:
Of course, I can't do the grey-scale shading in a stamp, and the really detailed stuff is impossible. But overall, I am very pleased with the outcome.
Now I have to do a UN Spacy mech to balance things, but first I have other priorities.