Frequency Analog inputs

We are looking at using the Netduino Go environment for a commercial application. We need a controller that can has: 1. Ethernet connection back to an operator control panel 2. 40 each 12 bit analog sensor inputs 3. 24 each 24Vdc @2A Solenoid drive output 4. 12 each frequency analog sensor inputs (~2MHZ) I see where you have a ethernet module in the works. I have found a few vendors with 8 channel 12 bit a/d chips with SPI output. Just don't see info on how to connect all the "glue" pieces for a go module I have found a few vendors with single or dual channel mosfet devices that will handle the solenoid outputs and are logic driven. Again, I don't see info on how to connect these into a go module. Frequency inputs get a little more interesting. I could use an Freq/voltage converter and connect that to analog inputs I was wondering if anyone had a more direct solution?? My other thought was a small FPGA and program the counters in it (seems a bit overkill) Thoughts? Regards Larry