Work top-down
to build bottom-up.

Start at the deployed system, decompose it to its bill of materials, and place every part by cost and differentiation — settled, cyclical, or frontier. It’s a map of the landscape, not a prescription.

There’s a real cost — energy, time, money, effort — to building without full knowledge of the market and the benefit. This surfaces that cost, so you choose by your goal: ship at scale, compete on a cyclical part, or push the frontier for science. Not everything is meant for scale. Every system here is an open-hardware baseline with a real, sourced BOM.