Interesting you have the same pump setup as me, i thought it was a later add on but your cupboard has the same blanking door too.
I think there should be some brackets on the right cargo door to support the cooker lid that slides off the unit.
Also a small wooden flap that drops down between the two seats, but looks like you have a modified piece to fit.
What's the black frame on the cooker unit? a slide? it would of swung out on a hinge originally.
Yes the black frame is a slide. it pulls down from the side of the cooker and then the whole thing slides out on it. No brackets on cargo doors though. Also I'm not sure what the 2 bits are here...?