As for damage, you do OK unless you hit something. The RD350 Yammy I
got cheap had 2 bent fork tubes. I thought I would be truing the front
wheel but it survived OK.
I had to paint the tank on a 125 I picked up and replace some stuff
missing from the right handlebar.
I learned how to paint with rattle cans in those days. The Yamaha
paint job was a 3 step process. The trick, as with any spray painting
is never stop moving and pulse the valve.
I wonder if "survival" of bike and rider is as true today, what with the
much more massive bikes and faster speeds and plastic parts...
I don't know, My GS is a 1000cc bike, but I managed to break my tibia riding my 250cc dirtbike 3 yrs ago down in Baja with much more protective gear including wearing trials boots. Hurts about the same if you ask me.