Ok, I got my first panel added to the lower front of the cab last night. It took me a long time, mainly because I added 1x2 strips combined with 1x4 strips to provide framing to bolt the panel to. Pre-drilling holes, drilling holes, test fitting, counter-sinking, measuring, bleh, etc.
It got me to thinking why not use little l-brackets to mount the panels to the sides? There must be some reason that most people don't do that? Cost? Structural support? Would the screws in the mdf just pop out if one were to use metal brackets instead of wood framing?
I likely won't get to work on the cab for a couple days, so I will contemplate this for a little bit. I think the l-brackets would save me some time though, since I wouldn't have to drill two pieces of wood.