Michael your reply is pretty much dead on, the first paragraph is almost identical to what happened to me here.
1) To be honest I contacted him in hopes of him still having interest or passion in the topic, and was hoping that by him coming back, many of the previous members would also come back. In a way, I thought it would be easier to have the site take off with him around, not mentioning that he had an old database backup with all the users informations.
However, after making the site and waiting, it seems to be not the case. Some of the previous members have returned since, and actually like the new site and direction I am taking it with.
I also managed to find one of the very first members a C63 AMG he was looking to buy, so in a way the site has helped make a huge sale already lol.
2) I heard from a friend of mine who owns a Mercedes-Benz Repair shop that Mercedes does go after businesses or websites who use their logo. And if you notice, most Mercedes-Benz fan sites don't have the Mercedes logo in their Header/Footer section or anywhere near the name of the website.
I'm hoping that it will be the same case with AMG. I have stayed away from using their logo in the header and have entered a caption on the footer mentioning that I'm in no way affiliated with Mercedes-Benz or AMG.
3) Very true, I'm planning to do that and get back to him with a price. If he doesn't agree I will still be fine because so far I'm having fun with the website
Thanks again, and apologies for the long reply back