Update tonight on third attempt at cover.
Hi Ko sprue
It is not that I want to be able to lift the cover up and down, it is more the need to represent the modern smooth polythene or whatever the fabric is made of and to get the droop and tension of the fabric in the right places. Since I want to paint the body work then place the pre painted cover over the built up sides and secure it with the right tension it needs a bit of flex to allow me to reform it oover the load bay side panels.
After advice from another site tried the tissue paper method. The tissue does work really well !!!!!!!!!! I used thin plastic coated wire for the front and rear frame and plastruct u channel with holes drilled to accept the frames for the centre top and side connecting rails.

Frame placed in pre drilled holes on wood and a pocket packet of plain tissue papers raided for a two ply tissue with no odd fancy textures. Drew out the shape of the cover as if laid out flat with assumed overlap areas for tie straps to frames.

Dipped the tissue in a very thin milky mix of water and PVA glue in a chinese carry out food tray and immediately laid over the frame. Added additional water/glue mix over the tissue with a basic wide brush to allow the edges to take form and keep the tissue moving.
I rolled the rear flap up over a thin piece of the wire again to keep the role tight and in shape. Cover is laying out to dry at this time.
Any idea what to use to stiffen the tissue up if need be and also what primers and paints have people used on this? Will Halfords car spray primers and paints take to this mix?
Pleased with the look, texture and shape so far. I hope it will still give me a bit of flex to allow me to place this last on the model. The rear load bay panel will likely be in the up position after a load (possibly portable water pumps from the Merc 280 G waggon and possibly some tools) is added in the rear before the cover is placed on the model.
Cheers Nick from IPMS site,,,,,,, Help appreciated as allways.
Nige