After building several version of Bob and Ricks box joint jig, I finially bought one from them. It works great! That's more then I can say for my versions. I used 1/4 moldings that I found at Home Depot, They are really not 1/4 squares. They are a little over that size and that was why the joints never fitted. Like a 2X4, which is not really 2X4, neither is the 1/4 square moldings.
I also got 4 clamps.
I know that it cost me about $55.00 for the five items, but the nearest wood working supplier Grizzly) is about 150 miles round trip, at 22 mpg, that's about 16 USD for gas and 3.30 USD for tax., and I would not have had the jig.
Ordered Sunday, they were here today, before noon.