Yes, including one sliding down an offramp during a rainfall. Have you ever seen a pre-downsizing era Cadillac Eldorado?
if you are not from europe its most likely no. you are from the states, donkervoorts arent sold there because of those crap safety regulations.
No, and I hope it stays that way for the production one. Have you ever seen any rare version of the W463 G-Class (think Cabriolet, 6x6, 4x4², Maybach Landaulet etc)?