I'm, slowly, working on the Duck Slam and a cinnamon is on the list...I'm trying to do it DYI entirely in my home state of South Carolina. Of course, killing all 32 species of ducks in the slam entirely in SC is somewhere between illegal and impossible because the harlequin is illegal everywhere except 1/year in Washington state and 4/year in Alaska. And, a Barrow's goldeneye has never been recorded anywhere in either of the carolinas. I'm at 25 now with a Black-bellied Whistling Duck and Common Mergansers as the most likely to get me to 27. I'm going to allow myself to travel to finish things out if I can get to 27. Here's my total right now - everything except the Cackling Goose and Tundra Swans were taken in SC...
As far as documentation goes, I've got a video pick-up of every species (except greater scaup but I'm working on that) and have every species documented in the USFWS wing survey. I'm not dong taxidermy - I'm trying to get a "magazine quality" photo of each bird with something meaningful to the hunt like gun, calls, decoys, etc and I'm going to bind them into a hard back photo gook for the coffee table. Five of the last 6 species I've added were killed over decoys that I made from old Herter's bodies and painted myself...