So---My foray into the world of hotrod carpentry has ended succsesfully!! The box is finished, the hinge installed, and my two side windows fit into it perfectly. (Almost too perfectly---I added a second strip of aluminum channel to the top of each side window to keep them from flexing at 70 MPH and it was almost enough to make them not fit into the box.) I still have to add a layer of felt to the inside bottom and top of the box, and I will machine up a brass latch on my milling machine. This box will get screwed to the bottom of my pickup bed to keep it from sliding around in there, and then I will have my side windows with me anytime I need them. (The rpu has a locking rigid tonneau cover).---Brian