Finally got around to taking some pics of the 'odd shaped cushion'! Here it is right in the front of the top where its always been. Then out on the bed, and finally in the position @Zed suggests it was meant to be used. Never thought of using it there, so still learning after 50yrs of use!
When you said you used it at the front I thought hmm yeah maybe that's right. Can you get up there, shut the flap , then bung the cushion in and take a photo?
The Van is back in the garage now Zed, but weather permitting it'll be out again during the week and I'll try to get a shot as you suggest, bearing in mind that once I heave myself up there, I might end up there permanently given that I'm not a sprightly as I was!!
Hi @Zed 'fraid I've still not had an opportunity to pop up and take a photo of the cushion in place, but I thought you'd be interested in the relevant page from the Camping equipment manual for the Continental. It shows the thin cushion placed at the far end when rigged for sleeping.