Of course! Such a master engineer should be capable! :D ...though I don't think I should ask him such a big favor so soon after his birthday. Give him a little more time to enjoy the residual merriment. Leonardo da Vinci's birthday was last Saturday. I'm such a nerd for knowing that.
You should make these little custom crafted items in bulk, set up a booth in an Artist's Alley in some Anime Convention, and get ready to instantly get richer. $35 per pillow would probably sell fast, but I'm just guessing.