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It's 304L steel. Regarding the legs - as little as possible, as much as is necessary.
The Falcon 9 legs are slightly larger and a finished product. I assume that technology is easily transferable to a Starship lander.

There are plans to catch the Super Heavy Booster, but it's early days for that yet.
Link to the full size pic. The struts wrapped in red coverings are part of the mechanism for holding the booster to the ship on its way back to port.
The struts wrapped in red coverings are part of the mechanism for holding the booster to the ship on its way back to port.
The octagrabber
Rumours abound that SN15 may indeed be going for an orbital flight...
Actually that might make sense given that it will be dumped on the sea at the end of the orbital flight
SpaceX are prioritising an orbital flight, just doing low test flights means work stops on the orbital launch pad. At the moment it looks like a crane production site.
Rumours abound that SN15 may indeed be going for an orbital flight…
The thrust dome isn't built for the additional vacuum Raptors needed for that. Still, interesting times ahead. And cranes, lots of cranes.
Rumours abound that SN15 may indeed be going for an orbital flight…
I think it's much more likely that they'll just do another lower flight - but 20km this time.
The orbital flight is pencilled in for SN21.
Not even sure there's going to be another flight for a little while as Tankzilla and Frankencrane need to be moved away from their current locations - and Frankencrane isn't even built yet!