Between serious stuff? That is some serious stuff! Love the RC option, and I just happen to have some 3D glasses laying around (seriously). Your cat is awesome. MY cat always wrecks my creations. Keep on building.
Even if this might not be a "serious build" like you said, I like the Halftrack and I can imagine that it must be great fun to let it drive... especially when the cat-bonus-factor comes along! And which other Halftrack could make donuts? Sweet build again!