I've revised the schematics a bit. First, the power board:
The change here is that a bunch of passive components have been added to the thermocouple input. There is a 1M resistor from the negative pin to ground. I'm not 100% sure why, but it's what the data sheet recommends. The RC network on the thermocouple pins is recommended to prevent RF from affecting the readings. Other than that, it's the same.