Here it is in plan view. The table is shown in red. The shaded areas marked coal and logs are knee high seat boxes. I've shown the doors (swung half open) into the main cabin of the boat. You can already see that the table overlaps the seats and so can't fold back to drop against the forward bulkhead. Notice the red dotted lines. These mark flaps which will fold in behind the table when it drops. The dotted T shaped thing is the supporting leg, which can be better seen in the side view picture below.
There is the leg in blue. It will be hinged to the bulkhead at the bottom, and must telescope up to fold away vertically when the table is dropped to the vertical storage position.
The final picture shows the view looking forward from the cabin into the cratch.
There is the table in red, hinged along its top edge. The flaps (dotted) are folded in to avoid the seat boxes, and the T shaped support leg is folded in behind the table.
The idea looks ok on paper. I have to figure out how best to make a telescoping leg and attach it to the floor, and how to give adequate support to the folding flaps. Rick suggests some sliding bolts at the top(as seen here) end of each flap. Then the T of the leg should support the outer end.
I can make the leg out of two bits of aluminium box section tube, one sliding inside the other with holes and pins to lock in at the shorter and extended lengths (like extending tent poles). Not sure how I would fix the T bar to the top of the leg though.
Anyway there it is. I hope to have a go at it when our conservatory (my workshop) gets above freezing. Any comments or suggestions most welcome.