Ian Field wrote:

The only place it was fed back from the MOSFETs is in your little fantasy
world.

Then what, exactly, does this mean?

"Does anyone have any application examples of the 555 with the source/sink
O/P used to drive the timing resistor and the discharge transistor driving
the external load?

The project is a 555 pulse generator with a complementary pair MOSFET O/P
buffer, it will run from any wall wart over 12V that could potentially
exceed the 555 ABS-MAX Vcc, so the 555 will have a simple resistor/zener
regulator, the Vdd for the MOSFETs will be the full unregulated rail so the
source/sink output won't go high enough to cut off the P-channel MOSFET."

Thanks,
Rich