Thanks to those fine folks at 80/20 I received the three 96" lengths of T-Slot necessary to build the first clock stand. My Dad switched out the wood blade in the saw for a metal-cutting blade while I calculated the optimal cuts. Once done I sliced and diced for about an hour.
T-Slot looks much less impressive in short lengths! After deburring the ends it was assembly time!
I'm using simple right angle plates to connect the parts. Since the stand is only holding a very light printer and guide cut from acrylic I don't need anything stronger.
After assembly I tried the printer on the stand and dropped the first sheet of paper (with a little manual assistance) into the shredder. Success!