Here's the final piece. This cord reel doubles as a storage for about 70' of extension cord that can be used by it self or when laid flat on the ground, holds the lamp support in the center of the reel.
The center of this reel is the 4" coupler and the plywood edges of the reel mounts to it from inside the coupler. The lamp support tube fits snugly inside this center.
I mounted a 2 outlet plug to power the lamp holder or maybe a battery charger. Tape over the wiring on the outlet so nothing shorts out.