Sorry for opening up this can of worms again. I live in a very old terrace house which was built in 1830 with a loft playroom/bedroom. It has a dormer window and a huge big radiator, with a proper staircase upto the room. We are going to use it for my model railway and my wife's craft room. The only problem i am going to have it getting board up to flights of stairs and around a sharp bend at the bottom of the stairs. I was initially thinking of buying 8' x4' 19mm plywood, but I would have a problem getting it up the stairs. So should I build the frame for the baseboard in situ and in sections of 2 x2?