GMC Topkick 4x4 Expedition Camper Build

Been working on frames to mount the panels on the roof. The front one is almost complete.
5" channel sides to give some protection from branches,...
There were a couple of really good welds - "like stacked dimes" The rest were like "stacked rocks" !! ...
Better than I can weld.
At some point.... and it can be post mounting maybe? Use a hole saw and drill some large holes in the aluminum channel to help air move out from below?.