You are one of 4 boats that I know of. Yours, BVizanor - Seattle, DArnold in Anacortes, and one for sale in Des Moines with MSC. You are the only swing keel that I know of, the others are fin keels. I believe all have the ext sterns.
It would also not surprise me to see one or two up in BC. I know of three Arcadia's here south of the border, one north all with names. The fellow in BC and I know of one other up there.
So a few more than you knew about.
She drives me boat,
I drives me dinghy!