It's an interesting concept, but like Madison I would recommend not dropping your really expensive electronics on the ground that hard. Also be aware that you will need to prove that your robot's belly pan is fully in compliance with current rule r6, wherever it get put in next year's rules, meaning that you will need to add some type of rubber tread to the bottom of it. My suggestion would be to instead of dropping your entire belly pan that instead, design four posts that do the same function, or look at 118's and 1114's drive train's drop down omni-wheels as inspiration instead. I also know that 1730 did something similar as the two previously mentioned, but instead they used a ball caster like these
http://www.mcmaster.com/#standard-ca...nsfers/=t2it6g.