I wonder if you have the original water pump on your car. On mine, I have the updated pump with a new drain pipe, and I can get the bottom distributor cap bolt off with a 5mm allen and some finger contortioning. If you look at this pic:



the bolt is set just high enough that you should be able to get the allen in and unscrew it about 10-20 degrees at a time, before resetting the wrench.

You'll still have to remove the drain pipe to get at the lower front cover bolts, so it doesn't really much matter. BUT, your pipe looks a lot different than mine. This is what mine looks like:



On the right (driver's) side of the pipe, there is a small bracket with a hole for the screw that secures the pipe into the water pump. Yours doesn't seem to have that, although I think I can make out the hole in the pump that it would ordinarily bolt into.

Anthony