Have you ever considered the Colortran Mini-Crab Dolly? It's from the 70's and its quality is unsurpassed. I have some information on a blog I put together some time ago. I may know someone that may be selling one. Let me know if your interested and I could reach out to them.
The Colortran Mini-Crab Dolly site is at: http://colortrancrabdolly.blogspot.com/
Also, speaking of the Moviola, I saw one last week at Visual Products in Wellington, Ohio. They have one for sale (check their website). Gorgeous condition, but man, I didn't realize how huge theses dollies were! It looks like a scaled down Mini-Cooper! Check out the Colortran and let me know if you'd like for me to check on it's availability.