My idea is to take the band launcher lose the wheels ad arms and gripper, modify legs.and continue to go from there
Other robots from Synthiam community

Lemon's Galapagos Mode- Scorpion Tail
I rebuild my Tortoise bot all the time and this is my short leg version with a scorpion tail. Just sharing enjoy.

PEEK's SAM Inmoov Robot
Slowly trying to build a complete InMoov Robot. I am a newbie learning as I go. Sure could use a mentor.

Ezang's My Tightrope Robot Without The Squeak, Sorry For The...
My video without the squeak 0 My tight Rope robot, enjoy