I bought both the floor and trunk pan at Carlisle.The fit and trials of installation I couldn't tell you about but...Small details like one of the crossmembers need to have hole enlarged the access captured nut for body mount bolt and the seatbelt anchors included don't exactly look factory but appear fairly stout.All told given the amount of welding it could save and the amount of skill involved to install these small details probably won't be a cause for real concern.The floor had all braces and inner rockers as one piece,didn't have a lot of flex,but are probably of thinner guage than original.The trunk and floor both have a flange to mate up under package tray to tie both together to appear seamless.If I could find a bodyshop in MD that could do the install in a timely and correct fashion I would be happy to give my opinions or any other observations.My car needs full floors,braces,and inner rockers so I figured I'd why not try the one piece.Probably didn't address all of your concerns,but thats about all I can add at this time.