Nice, Chicago, looking forward to see what you wind up with down the road.
Actro, I've planted hundreds of thousands of willow cuttings, they were used for erosion control, revegetation and reclamation projects, my field of work for many years. We used, willow, red osier dogwood and cottonwood, they all respond similarly. The large ones did tend to do better, better growth and success rates. Old fissured bark caused higher failure rates though. Mostly we kept cuttings to a smaller size due to logistics of handling and transport but would sometimes throw some big honkers unto the ground, largest cuttings about 9 or 10 inch diameter I guess. The big ones usually were cottonwood or salix lasiandra.
My wee one today, trying to grow out a crown of sorts and keeping branches pruned back.