Wrapping a Polaris Ranger Crew hood and fenders...

Hi all!
I've been tasked with designing and wrapping the hood and fenders of a Polaris Ranger Crew ATV. They want an american flag starting at the bumper and waving back toward the windshield... it's painted plastic and I have the actual pieces here in the shop. I can take measurements all day and take pictures, etc... but #1 I'm not too proficient in designing wraps without a template and #2 I don't have a template! What do you professional designer/wrappers do when you don't have a template? I've tried taking pictures of the different pieces and putting them together like a puzzle (see pic) and sizing it to what I measure but I feel like it's not going to fit right... any tips? Thanks in advance!

 

Thanks, we can definitely try that. The pieces are small enough.