This winter I also set up the basement "practice range" and in addition to the items you listed, I found a "mini-plane board" to be indispensible. I had fully intended to build a full size "Homer-style" plastic sheet thingy, but never got around to completing it. I did, however, manage to build a mini-plane board out of scraps of plywood and 2 x 4s that I designed to be used with a putter. I discovered, though, that it was far more valuable for my full swing.
Despite close to 2 years studying the Yellow Book and using lasers and flashlights and what not, my swing plane was way off. I knew WHAT I wanted to do, but couldn't translate that into the correct action. The problem for me was getting the stroke started correctly, and the plane board was just what I needed. My default habit was to take the club too much to the inside and not enough up. The plane board allowed me to understand, and more importantly FEEL what the proper three dimensional takeaway is supposed to be like. I found it far better than a flashlight or laser because I was using an actual club to feel the correct motion and alignments.
"De Plane! De Plane!" Important to Tattoo and Mr. Roarke. Absolutely critical for my golf stroke.
One comment I have heard regarding the explanar is that because the shaft only contacts the plane at one point, you could still have the sweet spot off plane. You need to look, look, look...
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