Here is a link to a blog post detailing my extensive exploration of this great ruin. The complex is composed of three five-story buildings that are connected, a small powerhouse, a three-story building that has partially collapsed, and a two-story structure connected to the rest of the complex by a walkway.
http://nassahegon.blogspot.com/2016/08/return-to-winchester-arms-new-haven-ct.html