The green car in the first picture was featured in the Dec. 2008 issue of Mopar Action magazine. Here’s a few pics from the write up. (Mods, if this is against the rules please delete.)
Good advice already given above, but just to emphasize what has been said, make several LIGHT passes along a tape line to get a groove started for your scribing tool to follow. You have nothing but time so don’t be in a hurry and you’ll do fine.