I decided to write mine up anyway, since I think it's way easier than Crokkon's method and probably a worthwhile tutorial to have. https://steemit.com/steem/@tcpolymath/make-multisig-transactions-with-beem-without-spending-all-day-in-the-transaction-builder
My example transaction is here.
I also wrote up a little bit about the philosophical differences in our approaches, because it interested me: https://steemit.com/steem/@tcpolymath/reflections-on-two-methods-of-multisig-transactions