Grigg apparently I was already busy writing my previous post when you responded.
I like the crossmember you've shown. I'm not sure I'd go looking for exactly that one, but I can imagine making up something similar using square or perhaps rectangular tube to keep some structure in place, but get it below the new transmission.
Thanks.
Our holiday guests have all left in the past hour, and I've done my part in getting the house back to normal, so I'm going to take some pictures of what we've done to facilitate talking about what's next.