Hi Rolf
The shelf over the drivers seat windshield is for the artillery board. It is a big piece of plywood in a canvas bag. It has a place to put your map or overlay for plotting your gun. One end of the board fits in that little shelf and the rest is held up by those other hooks you refer to. It takes up a lot of room over the drivers head but back then everyone was shorter anyway. I can't put pictures on here but I could take a photo of mine and send it to you if you like. If you ever get to Dirk Leegwaters place he has one. If you need one we could probably get one for you and bring it to Holland the next time I get my air miles high enough.
Barry
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