I asked a fellow modeller if he had fitted the cab roof yet, because it too has been yet another challenge to overcome.

The reason for the challenge is that the profile of the roof rib visible in the shot of the roof below is a different profile to that of the rear frame of the cab which supports the cab roof at the back.

When I first fitted it the front of the roof didn’t go anywhere near the front of the cab (it did fit when I first “rolled” it some time ago. To get around the issue I cut a front rib to fit just inside the cab front which brought the front of the roof into the right shape again

This left a gap in the middle of the roof at the rear which I filled with solder (just visible in the photo below as is the additional rib at the front of the cab). Not very elegant but it works.