spatialcomputing.info

I have 3D modeled a car hood and i would like to use that custom 3D model for a 'Pre-Viz' on the actual car its intended to go on the only problem i have ran into is that the hood surface is Non-planar so 'Sticking' it to the car in AR and having it remain in a static position while free roaming around the vehicle is hard. (using iPhone for AR btw and i would prefer that if possible)

i have only tried using ready made AR solutions like iOS apps but they all seem to fall short in this use case. I was wondering if anyone had any possible solutions, i wouldnt mind having to come up with my own solution using AR studios but if possible would like to avoid as i dont have a ton of experience in that.