Are you sure? There is a *lot* more scope for b*gg*r*ng it up trying to glue a continuous sheet of, lets face it, quite fragile material. I made a cork board for my son using cork tiles. As long as you even them out side to side and top to bottom, the joins look fine. The substrate is, to be honest, more of a problem, unless you double them up as you suggest. It's easy and neat to glue onto a plywood substrate but you get very limited depth for the pins if you only use one layer (as I did) it still works OK though. Glueing to particle board as PP suggests would be possibly less secure but woud give full pin depth.
have 500x500mm sheets of cork, up to 6mm thick also cork sheeting on the roll up to 5mm thick.
The site is a bit of a pain to navigate, in that you have to register and get a customer number to use it - worth it I suppose if it sves you faffing around with glueing tiles together.
It's a very soft board made of compressed fine fibre, almost like compressed kitchen paper, so it takes pins well and is often used as notice boards by itself. The surface isn't too robust though so putting cork tiles on it gives you a good depth of material soft enough to take pins and quite stable while also giving you a good wearing surface.
1) Wait for next Woolworths sale and buy as many 50cm x 80cm pinboards @ £1.99 each as you require for the size you want.
2) Rip off the flimsy wooden frames.
3) Glue the separate small boards onto a 6mm plywood backer board.
4) OPTIONAL - use "L" shaped battern to make new frame for large board (available from most Sheds - they usually keep the small-section wood batterns and mouldings in a horizontal display thingy)
4) Screw to the wall using brass or chrome screw-cups - or (if unframed) mirror corners.
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