Warren,
You probably should not use two pieces of 1/4" to make the end pieces because
you'll be placing the screws right where the joint is between them (very hard
to drill a proper pilot hole).
There really isn't anything to through bolt to in this application unless you
used threaded rods that went from the top cap to the bottom cap. The pieces
should be bedded in silicone adhesive in addition to the screws. If the
pieces fit tight all of the load will be in a fore and aft direction and should
not
cause a problem. One potential way would be to use threaded inserts but I
don't think it is necessary.
Bram
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