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First things first. If you don't have access to a spectrometer to test what is coming out the eyepiece, then you are risking blindness.
Yes these filters can be used to build a functional solar telescope that gives prom views similar to a PST but far less surface detail, but you can't just use them on their own.
David Gorski has plans that if you follow you can build a scope using these and a blocking filter, but the cost will be up around or more than a PST.
Solar foil can't be used to view Ha, it blocks it all effectively, so that is a dead-end path.
Basically, you can get good surface granulation and sunspots with Baader AstroSolar foil and a good polariser filter or Baader Continuum filter, or you can get Ha views with more expensive etalon based systems like those from Coronado, Lunt or Daystar.
I would head over to Solarchat, they have a good library of reading and plenty of people to help you not waste money or damage your eyesight/equipment.
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