Space X's Falcon Heavy is supposed to launch in november with a 57 ton payload. I'm not sure how big the payload can be.

I wonder if you could make one with a few bits of lens that fold out? They'd have to be positioned more accurately that one wavelength of light (to ~100nm say or a 10,000th of a mm) which is tricky on earth but might be doable in space where you don't have gravity making things flop?