This instructable is for a large diy wooden picnic table which is easier to step in than a traditional picnic table.
It is made completely of two by fours (89x38)
second pic is metric ,third imperial.
If you are going to use a miter saw remember that most miter saw gauges are set up off 90 degrees to the back of the fence! (http://www.thisiscarpentry.com/2011/07/29/miter-angles-miter-saws/).
So for 51,2 degrees you have to set your saw to 38,8 .