Hey,
I can modify that plastic part for you. I am using Catia v5 for designing. I have extensive experience of designing plastic parts. I have designed headlights of cars for Honda and Toyota recently. You can check Honda civic 2015 headlights as my previous work. I was the project engineer for that light. I will also do the draft analysis for moldability , clearance check in needed, parting line check, thickness check, drawing preparation if needed. tolerance and other things with the design.
Please provide more details of the part you want to modify.
Thanks
Gaurav Jalan
MS Mechanical engineering, USA