I have built something almost identical to what is pictured in your linked thread, with the exception being my materials were galvanized (leftover cellular tower parts)- I also built a set with the base being similar but the mounting provisions were external. The side facing the exterior had a 10"×6" plate welded to base plate opposite face had a 6"×6" plate attached to base allowing 5/8 all thread to be thru bolted at a height of 4 1/2" and on the exterior side 2 lags to be installed at about 8 1/2"( in hind sight lags probably not necessary/ if I did it again would probably make both plates same ht. and add extra thru bolt's) forgot to mention that I sprayed welds with spray gal. I only did this due to not wanting to pay for expensive factory anchors and I have a lot of galv. material. The first setup was adequate the second was the bomb, although once members were tied together no difference, but initially the first one with only a single connection point and 2 bolts allowed it to move (expected) but the second was very strong almost immovable for a post standing without upper connection or bracing.
I wish I was closer I would give you a pile of galv. material if you decided to manufacture your own.
The good setup is a little more than an hour from me at a friend's. We built a shelter to cover his Woodmizer me my planer.
If I can get a chance pretty soon I will try to get a couple of pics,if not Maybe I can slap one together in the next day or so and stick a cut off in it for illustrative purposes.... Matt (that was confusing trying to explain it,so I know I need pics)