Vehicle fenders

Greetings. I am looking for help in building rounded vehicle fenders. I have an idea that I may have to build it sections, but I do not have the design genius to do so. I have been cutting and gluing and scratching my head, but it seems I am missing something.



I am preparing to build the MRAP that is in the download section.



If you look at the navistar MRAP vehicles you'll see the fenders. Thanks for any help.