SpaceXAi's S-1 names Terafab, its partners, and the terawatt compute ambition, but avoids the cost question. The press has filled the void with figures of $55B, $119B and, at the top end, $5T; none of which come from SpaceXAi. We built the bottom-up model the filing leaves out, and the bottlenecks we found look different from the ones the press keeps chasing.