I’ve just realised from this close look at Thunderbirds behind the scenes in 1965 that Thunderbird 1 is essentially the SpaceX Starship. The evidence:
1. Both craft arrive at the pad vertical on a self propelled cart.
2. Pilot access for Starship is likely to no less of a nightmare than TB1
3. Starship lands vertically on its main rocket exhaust
4. Prior to landing both craft do a backflip from horiz to vertical