I am converting my 96 Miata from a CSP time trials car to an ITA Miata and have a couple of quick questions

After reading thru the IT section of the GCR more than once I have a couple of things I am fuzzy about....

1) I don't see where I can remove the mat on the firewall behind the dash yet each picture I see of a car stripped down for a cage install that sucker is gone. Do you just remove that for painting and cage installation then put it back before the dash goes in?

2) A Pillar trim and the trim around the windshield frame....may these be removed under "cage fitment"?

3) Door sills...same question?

4) The AC box can be replaced with an AC delete duct from Mazdaspeed no questions asked right?

Thanks all!