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We have an hand-drawn horoscope by Kepler, discovered in 1999, but it?s not his own. He wrote about the details of his chart in a letter to Johann Herwart in 1597. Some of the text is quoted in Kenneth?s Negus?s article at http://cura.free.fr/docum/15kep-en.html

His biographical material was published by Dr Ch. Frisch - Joannis Kepleri opera omnia - Frankfort, I858 - I87I, 8 vols. I?m not sure what that includes exactly or how accessible it would be, but if you dig anything up, please let us know.