Nice acquisition. I really like that color. Can you measure the original hole spacing in the mounted tom? That will help you know if it is indeed a Slingerland shell. It probably is though. It is not unusual to convert concert toms into double headed toms. Usually that is done by adding a lower set of lugs and cutting a bottom bearing edge if there is not one already. A lot of the earlier concert toms had a bottom edge and in the case of Slingerland, this edge was protected by a trim ring. Converting a concert tom to a center lug tom is less common and, as you can see, required more effort. I really like Slingerland drums and I am also quite fond of stick saver hoops. Enjoy!!

Welcome to the Slingy club, best sounding drums on the planet! Nice little project should turn out great. I don't think you overpaid at all, the 14x14 is worth most of that price. I'd maybe look for a new rack tom, but otherwise looks like it'll clean up real nice.