Engine Kits or Plans?

Hi All:

I now have what I think is a fairly complete set of data ack
hardware from which to build up a control system. Basically A/D's that
move their data via a TCP SOCK_STREAM and another model which uses USB.
I'd like to start integrating them into a control system with hardware in
the loop. Are there plans or kits for small liquid fueled rocket engines
that I can use as a testbed? Small as in less than 50 lbs of thrust. I'd
like to work with Kero and LO2.

Andrew