You are correct, with or without dilution, there are stocks with way higher PE ratios, exceeding 100 and stock is over 100, so what you calculated is completely valid conservative valuation.
1. not taking into consideration equity offerings to raise new money for capital requirements 2. your earnings multiple is a bit higher than the historic. 3. you assume spspa writedown
all in all, good job though on trying to take a good shot at a valuation :-)