Yes, I picked up some 3/4" heater hose from Auto Zone and ran it straight to the bottom from the T. Capped the outlet on the bottom of the Factory tank.

I actually just plugged the overflow vent from the jegs unit...

It could easily be ran in to the factory overflow box from there but I didnt because the pressure , nor heat of this system should ever be enough to actually cause the radiator cap to pass / vent any fluids...

Really, the cap is nothing but a way for me to check and add fluid as needed more than it really is going to be for any type of venting.