Hi Paul,
It is a bit of a beast. My parents have been growing it in their yard in NYC since I was little. Luckily for the collection, my dad had moved it three to five years earlier to its new spot, so the roots weren't all that bad to deal with. Even then, the vine had grown to about 6 feet wide and probably 10-12 feet in height accounting for the trellis.
I remembered it being a pretty good size, but didn't fully appreciate how big it was until the shovel was in my hand
Luckily with the prior transplant, it only took my dad and me maybe a little over an hour on the collection, with only a small handful of very thick roots to cut off but plenty of fine feeder roots in the rootball. I cut it back to about 4 feet in height, and managed to keep a three foot branch with lots of foliage to help it get through the fall as well as two foot lengths of other main branches to plan for eventual dieback. Even then, it still managed to put out quite a bit of new growth before winter set in. I've seen some slight movement in the buds recently, but I imagine I still have a few weeks before it leafs out.
I'll try and post a picture when I'm home.