Good advice, I will do exactly that. My real worry is not messing up the weld, since it will mean redoing one or both of the T brackets if I screw it up.
I noticed in one of your pics that you have two holes drilled on the bottom part of the T bar that are empty. Were these for rubber nubs that you decided shouldn't be there? Or were they just not installed yet in the pic?
Seemed to me like a good place to put them in addition to the main vertical bar, but if you found out later it was not, I'd like to know why.