i see whats hes talking bout you could just try and put it over but the prob with that is our headliners are suspended in midair they dont have foam between them i ended up pulling the stock headliner out and sewing loops for the rods in mine but then i didnt use tweed either i used a type of valuar
ive also seen the flat headliner its doable just takes some work and some thinking i really didnt feel like thinking lol
heres a pic of my new headliner