Real-time close loop system

Hi All:
Designing real-time close loop systems is not cheap.
Trying to look in concept of industial controllers.
Real cost of 8 bit controller is about $150.
Using three PIC in closed loop architecture
could reduce cost of unit to $50.
See below my vision how to force using PICs
in wide range of applications.
Because of free limited time and will to make this project works,
I am looking for members wishing to make together this project.
Project requered to write 3 separated program that wll be
united by conceptual design that will employ simple task.
Second step is testing this design idea.
By modifying code each of us will be able use this project
for own development.
I appreciate any thoughts.
Best Regards,
Leonid