Ok, I need to make a choice. What should I do first custom fiberglass interior or exterior?

For the interior i was thinking of pulling out my back seats and replace it with 1 bucket seat in the middle with custom sub enclosures on each side, and redo my door pannels and the center console armrest area.

For the exterior I was thinking of making costom splitters, hood scoop (5th gen, or gt4 style) and for the back either splitters or a custom lip and put my tail pipe in the middle with doul tips.

Ive been resaerching and talking to many people about fiberglass and I am quite confident i can acomplish this project, Im not going to just start tearing my car apart and go at it I'll start with a smaller task like the splitters or the door pannels and then I'll go from there.

If you have any advice please tell me. Thank you, Jesse