In case it is of interest the basic design of our wheelhouse as follows ;
The heavy front and back windows hinge forward and are supported by struts, once up a beam is attached each side front to back, 4 curved beams are then place into slots on this beam going from side to side essentially to stop the canvas roof sagging. The side windows are on lift of hinges so they can be removed, it would be nicer if they could just hinge down but the cabin gets in the way. When replacing them they are held at an angle, slotted into the hinges and then raised to verical and clipped to the fore aft beams and each other with protex clips. Once all windows are in place the canvas is rolled over the roof structure and secured all along the edges with turnbuttons (see picture) but requires sewing
I have attached some pictures. Note that we put a couple of straps over the roof in winter as our mooring is very exposed, I d not think these are really necessary, the wheelhouse feels quite solid once all clipped together it is just belt and braces.
The canvas cover can be made from tent material which is very lightweight but we used lorry type vinyl using a hot air blower to weld hems all round and a clever little punch from J Clarke Marine to make the holes for the trunbuttons. (see picture)