how much would it cost to redo the roofinh inside my car?

Well it depends on how you wanna do this. You can obviously buy all the roofing parts from a BMW dealer and just install them which is very pricy since you will need a head liner, all pillar cover, and FZD cover, visors, grab handles. Other option is to find a cloth shop and see how much they will charge to remove the old fabric and put new in going to cost a lot but less then the last option. Or the last option is to find a donor car and take its parts probably the cheapest route. Hope this helps good luck

Headliners will be a few hundred dollars. I'm sure you can remove the panels over the pillars and have whoever replaces the headliner cover them with the same material at the same time. Just make sure to see some of the guys previous work before you let him at your ride.