"Bill" wrote:

I changed the way the top box is affixed, adjusting it's size
slightly. If anyone besides me is
considering this project or just wants to see, the new pic is the
2nd one.

http://web.newsguy.com/MySite/
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Do yourself a favor and buy a box (100) of 1/2"-13 x 4" lg hex head
bolts,

a box of (100) of 1/2"-13 hex nuts and 5 pound box of fender washers.

Lay out the bolt holes using trig function calculations.

Assemble and get a beer.

Enjoy the results of your efforts and move on to next job.

BTW, buying full boxes of fasteners is the ONLY way to get
a decent price.

Lew