I've done some more digging into this, looked carefully at some good photos on the IWM archive, used various Photoshop tools to compare panels (checking for differences in colour), and I've reached the conclusion that there was nothing painted on the side or front panels until after July 12th at least. I've made a small montage here.
The June 10th photo shows that the large front panel doesn't have anything on it, and is the same shade of grey as the neighbouring panels. If it's slightly different that could be because of painting over the 'DUVAL' sign from the previous owner, but regardless, it clearly doesn't have any writing there.
The July 12th photos show that the panel above the door is blank, and there is just a small 'Cafe Gondree' sign above the door. The other July 12th photo again shows the front panel is blank.
So, I'll just be painting the small above-door name sign, and no large maroon signs. Those are all clearly much later than D-Day or the following month. On one hand it's a shame not to have the large distinctive sign, but I want my table to be as accurate as possible, so I'll stick with the evidence I can see here.
Thanks to everyone that's helped out here. I'll post some pics of the model soon
Joe