Craig M. Bobchin wrote:
[...]
I imagine it would cool down very fast, though dust on
the optics could be an issue.

If it hasn't been done why not? Is it a collimation issue?

The Meade RCX400 has a gap between the edge of
the corrector and the inside wall of the front cell. This
promotes cooldown and also the ingress of dust and
bugs.

What about cutting slots in the OTA to help speed
cooldown.

Or "ventilate" the side of the OTA with a .357 Magnum.
:-)