Don't waste your time. The sun comes up every morning. With it comes all the heat you could want. But you don't want heat, you want electricity. Heat is easy. People have been harvesting solar heat for forever, there is nothing new to learn about solar heat. You need to concentrate on converting that heat to electricity. That's the hard part. Build a convertor. Your real proof of concept would be getting some useful electric current from heat. Building a dish or trough is rewarding and fun, but you can get heat on your stove top! Build a converter, I'll tell you how to power it.
I was going to give you some tips on constructing solar collectors. But that would keep you from solving the real problem.
That's why I'm collecting just heat. I'd love electricity, but Stirlings and Tac's are not available parts at this time.
Build a converter!
I'll give all the heat you want!