Wow, seems like an ambitious project. I have been smoking, and before my smoker, I was roasting turkey breast for years for sandwiches. I now purchase 3 full breasts per smoke, that gives me 6 sides. I smoke with the meat on the bone, with applewood primarily. when 165-170 I remove and let cool. Debone, vacpac, and freeze each individually. Upon thawing, I use my rotary deli slicer to slice thin for sandwiches. While the slices are not all uniform, I can get some nice slices by cutting across the wide part (still against the grain) and makes a great sandwich.
Seems like you are seeking uniform 5" round slices? If so, and you want pure turkey, no filler, I suggest you get the pre-boned turkey roll sold in supermarkets, or take raw turkey off the bone, and roll and wrap in cheesecloth or just tie it (many chef's videos to show you how). You can then smoke without the bone, and get 100% pure turkey breast, no filler.
Your project sounds interesting, let us know how it turns out. Keep in mind, your "sausage" will have different densities, so, you may want to go a little higher in temp, just to be on the safe side!