I have built several PIC interface for FMS.
I have built the circuit using surface mount parts and a double sided board. I was able to fit the entire circuit in a DB9 shell. It makes a very compact interface and it does work well.
I am located in Canada so can easily serve Canada and USA but welcome world wide shipping.
The cost for a fully assembled and tested interface is $40 Can or $27.50 US.
If interested please email me dkoroluk@mts.net
Dennis