It's possible, but solar thermal has proven to be less efficient than photovoltaic at capturing energy from the sun. The only advantage is that you can coast on stored heat after the sun sets to keep making energy. Other than some pilot plants solar thermal is going nowhere.

Condensing the steam down and trying to extract energy from the condensation flowing downhill is orders of magnitude away from being worth it. The sun is boiling a few gallons of water per minute at best, while hydroelectric systems are measured millions of gallons per minute.