Mine has similar marks, but given what it's been through I am surprised how well it has held up. I have put a plug on the lead for quick installs/removals for more full on runs.

Today I had a run at the local track. Jumping is still tough- need full throttle to keep it from nose diving (and that's with a rear mounted spare and chassis weights). Just gotta keep on the gas hard. Landings were nice then. Hit a pipe hard and pulled off the rear a arm. It was just one of the adjustment blocks pulling out, and the package has about a dozen spares. So up and running again