JEFF HYMAN AT COOPERSTOWN FUN PARK Proposed Waterpark Scale Won’t Be ‘Overwhelming’  Developer, Visiting Prospective Site, Says Market Study Guarantees Success By JIM KEVLIN • for www.AllOTSEGO.com COOPERSTOWN – It’s going to be big, but not as big as the maximum build-out in the Hotel & Leisure Advisors market study. H&LA’s report, released on Wednesday, estimated a year-’round waterpark development planned in Hartwick Seminary could fill 400 rooms.   Jeff Hyman is planning 200 rooms, the principal of Hyman Hemispheric, the development firm, said in an interview and on-site tour this afternoon. H&LA concluded the market can support an 80,000-square-foot indoor waterpark. …