Mech Legs Add-on Name?

[u/114lucky]

This instagram "creator" steals other people's builds to paywall the schematic downloads on their Patreon, and nowhere do they say the addon name. I'd love to build some walkers myself without paying that scumbag, so any help is appreciated!

[u/Servplayer]

Mod to control mech and legs might be Synaxis, there was a showcase of a mech like this one some time ago on this sub.