I'll fit this kit on my car first, and I'll take it to the shop for painting. It's because I'll also modify somethings on this kit to make it look a little different. I think your kit could be the copy. That's why the thickness is thicker than the original JIC and it requires a lot of sanding to fit. My kit is also a copy but it's made of hi-quality plastic, not fiberglass. I'll put it on my car very soon after I'm sure my turbo system is running perfectly. The engine is already running with the turbo on 4 jacks. I'll put the car down in a week or two.
Once your car is finished, let me see some pics of it. The JIC is always my best choice overall. Other kits have some nice areas and some normal areas (not interested). For example, the Vertex front is nice, but the sides & rear are just ok. The AC front and sides are nice, but the rear is too plain and nothing special. There're more kits out there, but none of them have the most perfect overall kit like the JIC.