Very cool, but may have some unexpected consequences. E.g., someone can probably use this to synthesize a bacterial genome containing every known drug resistance gene, and this is just the first thing that comes to mind. Possibilities for bioeconomy indeed.
This may be as good time as any to plug my calculator for finite resistor networks (including grids) [1]. It works by eliminating non-terminal nodes one by one with the Star-Mesh transform, while keeping the exact rational resistances at each point.