This is different. This person wants a solution that can be built with common materials with fairly standard tools and at small scale, not a scalable commercial

This is different. This person wants a solution that can be built with common materials with fairly standard tools and at small scale, not a scalable commercial power plant. You can build Stirling engines at home with common materials. We're not comparing 10MW power plants here. So the question is, for a comparable weight and size as this solution, how difficult would it be to build a solar powered Stirling engine and what would the power output be? I expect the Stirling engine to easily come out on top.