I'm blown away by this circuit. I'm surprised that your LED is not burning up, as you have the current limiting resistor in parallel with the LED instead of in series with it. The current limiting resistor to the base of the power BJT can be almsot any value, providing it gives enough base current for the collector current required.
Not to be picky, but if you only had 4.7k's on hand, why did you bother drawing the whole parallel combination of resistors? It would seem logical to draw a schematic as representative of what the schematic is supposed to (ahem) represent, rather than what components are used in the end to build it (e.g., 5 4.7k resistors in parallel instead of a 1k resistor).
Nonetheless, the 555 looks like it's wired incorrectly, as there's nothing on pin 2 to trigger the beast (usually connected to the network around 6/7). Maybe you have actually built the unit differently than your schematic shows?
Good luck. I hope you find what you're looking for.
--Scott
(okay, maybe I'm tired and a little bitchy tonight--sorry)