Hi, is it Steve? What's sad, if you where changing a front indicator lamp you would have swamps giving advice, but when it's something outside their comfort zone and slightly more complex you get very little advice. I've come to the conclusion that there a few specialists on here in certain areas and quite a few chancers offering crap advice. The search function still isn't up to a satisfactory standard, though we can't mention that, even though it's our club. Now to the floor, removal of the old rivets laying on your back will take about a day, I would use an old wood chisel taking the top off the old rivets for the main areas of the floor and where it passes under the side skins I would drill these out. After the floor is removed go around and pop the remains of the old rivet into the chassis. Having never replaced a floor, are they pre drilled if so check drill hole positions against the old old ones to see if these correspond and adjust if necessary and either borrow or buy an electric or air riveter. I would imagine a second pair of hands would also be useful and if you google Cleco clips it's a method of holding panels in place before you rivet, these are used on aircraft panels before assembly, some area of the floor will have a sealing compound you will know where from the old panels Good luck but you should be able to do this. Regards phil