Related question: is it possible to build cylindrical reflectors (more precisely, two dimensional reflectors with a constant parabolic profile along X axis), gather the light into a linear CCD array and do the Y axis focusing in software?

Reason: this will allow us to fabricate mirrors either by bending planar materials or by using a grinding tool that has the shape of the full parabolic cross section. Theoretically this should be a lot cheaper than the grinding methods we use now.