Thanks, I don't own the URD version, but I'll imagine if you rename the car_chassis.dds to whatever name URD uses in the folder it might work. Otherwise, I would recommend the yezhrod version, it's free and great to drive!
For a first effort this is outstanding, keep it up! Add in some higher resolution logos/text and this will be right up there. Can confirm also works with 'oreca_07', just need to rename car_chassis.dds to Oreca_07_LMP2_2017_livery.dds. Thank you!