Just found and read through this whole thread. Brilliant work and I enjoyed the story of how you created them. You never ended up posting pictures of the finished Sentinels with their stands, do any exist?
I'm just getting into the haunting scene (second year in our first house) and these are on my list for next year. Figure I'll start small and work up to them. Love Rot's work and I think you did him justice.
With the help of a blower from an old inflatable and some dryer vent and duct tape I was able to breathe new life into my dragon inflatable. Just adjusted the zipper at his base to offset the extra power from the larger blower.