For a standard size stone (stone blocks from the Giza quarries) a stonemason needed about 4 to 5 hours with good tools. For a casing stone (from the Tura quarries) about 8-10 hours, for a corner stone probably more like 10-12 hours. To process the 500 stones daily about 300 stonemasons were needed and as much helpers.
It's possible to build a sliding barn door for the cost of the lumber, but there's still the expense of buying the track system ($100-$2,000, depending on weight capacity, materials, size and style). DoItYourself.com provides instructions for building a sliding barn door .
Exterior door replacement in an existing space costs around $250. To create a new space for sliding glass or French doors it might cost $500 to $1,500. A basic knob and lock set costs $50 to $100; designer exterior door hardware costs more. Exterior door installation is a manageable DIY project.