The Deluxe priced at $49k is very basic finish that could be replicated for $30k max, potentially much cheaper. So does a 1kW solar system bridge the price gap? Not even close

The reason you anchor on that 80k number is because custom building usually has a lot extra. Better quality. High cost materials. More carpentry. This is basically a plywood box and a solar system. And a solar system of this size is only a few grand installed.