[prisoner6]

telescope mirrors need to be curved in order to produce an image, and I am not sure how they will do that.

I would imaginea combination of vacum and pressure with the film between. Kinda like air over oil suspensions. Vary the pressure and you can change the focus of the mirror. Tricky, but no t impossible.

prisoner6

[chainsaw]

Or two membranes sealed together at it's edges and inflated with a small amount of nitrogen. Presto a bicurved optical mirror.