Although it pains me to say it … 
I took Ryan’s advice and what Peter mentioned and revamped the cupola MG ring. I did have doubts about its workability so started afresh.
Cut the legs off I put on, and then trimmed off about 2 or 3mm from each end to allow it to sit better and closer to the area where the hatch sits.
I then added two small uprights towards the rear on both sides of the ring, and extended the cupola top slightly (between the tweezers) to allow for another support to sit centrally under the ring.
It now sits slot more closer to the hatch, and lower down.
Dry fitted the new style cupola and the RWS …started to paint the drop down table, and added an electrical junction box for the RWS for the cables to feed onto the box body.
The table wooden top and hinges some tidying up as the paint ran a bit the the outside she of the table and it’s legs are Tamiya dark iron, table top is Vallejo old wood.
And the RWS cable junction box.
Will carry on finishing off the cargo bed tomorrow and get that primed.