Hi Sam,
I made some tests for deepsky imaging with ASI174MM and I am rather enthusiastic with it.
Is it possible to arrange cooling for ASI174MM with external Peltier cooler attached to camera body? Is there a good thermal contact between sensor and camera body? If yes, I may try to make a "cold box" for the camera.
yes, you can find some solution in our forum
just the cooling for 174 is not very high effective
because the case doesn't touch the sensor
anyway, it helps