Okay, sorry for the long delay.
1) Learning Strategies does not sell a polyphasic sleep course. There's really not that much to learn.
2)It is possible to do--Buckminster Fuller lived on this for schedual (the full polyphasic--just 2 hours of sleep) for one year. If you are undecisive, consider just sleeping a little less, e.g. 4hrs, etc. See my schedual a couple posts above.
3) I don't think it would be bad for your health/muscles, but I would try to get an hour delta w/brain wave generator. I would also eat entirely in the zone. (FYI there are a few books written by the zone guy Barry Sears) The Zone diet is not really a diet but a life long think and is the best health/nutrition diet. It will help you get more energy, etc.
4) I am currently not on the polyphasic sleeping schedual because it won't work with my current schedual--so I don't know everything.
5) Check google for links to polyphasic sleeping sites--there's not that many. 
Just my five cents 