Is a down UQ compatible with the SS UC - or are the two mutually exclusive?

If the UQ is between the hammock and the UC, I wonder if the UC would overly compress the down UQ to minimize effectiveness - and I'd worry about condensation inside the UC.

Yet if the UQ is beneath the UC, it seems the UC would serve no purpose at all.

I've got my eye on a new UQ, but it seems like I'd be wasting the SS that I've already invested in... am I missing something?