What are the preferred materials for baseboard construction? I will shortly begin building an 11ftx11ft layout with a central area approx4ftx2ft. This will be in my loft. It will be semi permanent, i.e. I will make it such that I can get it out of the loft if I sell the house but it wont be exactly like an exhibition layout as I am only likely to move it once. I want to make it in nominal 4ftx2ft boards but may vary this depending on what will go through the hatch etc. I want to use mdf board as it will be easier to lay track. I know plywood is preferred but I don't want to drill holes for the track pins.Is half inch mdf ok or should it be thicker? My main question is regarding the frame. Would ordinary planed softwood be sufficient or would the shrinkage with age and temperature cause problems? What alternatives can I use. The club I joined are building an exhibition layout using an mdf frame. I assume that this has been sawn from a sheet with a circular saw. Can anybody tell me what they have used and how successful or unsuccessful it was.