I had another 3 hours today so I got some more of the cage done in Project Murdreous Overkill.  Sleeving 1.5-inch tubing into 1.75-inch 0.120 wall lets you telescope the length longer or shorter for mock up.  I used the trick to determine where to drill access holes to the interior cage.

I used a holesaw to buzz through the cab.

Put the cross bar inside in front of the holes.

Burn in the tubing from the bed downbars to the crossbars.

Getting there.  Almost looks like I know what I'm doing.