Why is it they tend to be stupidly expensive? Got a quote from Sliderobes to do just the tracks and doors (no internal shelving or other sundries). It's wall to wall so they have no end panels to install. Walls are 99.99% plumb and level so no packing out required either. "Starts from about £2.5k" was the response... seems a bit steep for some metal and sheet goods. If I was asking for some rare, solid timber fair enough, but it's probably MDF or MFC!