beams are 1x10 on the sides and 1x8 on the bottom. The crown is either a 3" or 4" cove crown. If you show the picture to your builder, they should be able to replicate it pretty easily.
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around $1,500 - $2,000 depending the fabric/options needed. The chairs would run around $1,000 each. Feel free to email sales@furniturefromhome.com with pictures/drawings of what you need. And be sure to check out some of our examples at http://furniturefromhome.com