Switzer's Nursery & Landscaping, Inc. The ideal height for built in sitting is 18 inches.... the top "sitting board" appears to be a 2x6 and the "side posts" are 4x4. The raised boxes look to be about 5' x 10'.... there is no set dimension you need to follow. If you are planning on constructing raised boxes, do a little mock up and test how far you can comfortably reach the center of the box. I happen to be 6'4" with long arms and can easily reach the center of a 6' wide box, that may not be the case for some. Happy gardening and good luck! ~ Glenn!
healthy green kitchen countertops with info on how to seal such things
cool towel rack
for the girls
barn doors instead of doors