I plan to use an original style headliner. The roll cage may push it up in spots but I think it should still work. I had the option of stock dash or non-stock (Aluminum) dash options when I bought the cage tubes. I opted for the non-dash cage for more forward cage room. But as I'm installing the tubes i've got the windshield tubes close enough to the glass that about a 1/2" notch in the original dash pad and it will fit over the cage. I'll have to notch the bottom of the dash to accommodate the diagonal braces.

So I plan stock headliner ?, stock dash with gage reconfiguration, Aluminum interior with just the floor pans carpeted from the seats to the firewall. (that real thin, lightweight carpet) And a layer of heat shield under the carpet (exhaust protection). Maybe heat baffles under the floor too. Maybe upholstered door panels, And maybe carpeted tubs if rock dimples become a problem.