Neitzchie wrote: There is no 'reinforced' perspex, tho you do get two different types, extruded and cast. The cast might be what people call reinforced. Its way more stable than the extruded and shouldn't warp. 5mm perspex will be perfect for your job.

Maizey is good, but if you live close to a Falcon, they are often alot cheaper than Maizey. www.falconsa.com/
Most times they are about the same price tho.

Thanx for clearing that up Neitzchie, both seem quite close to where I live. Maizey is already cheap so will try Falcon as well. I will be going to Builders this weekend to check some prices on hinges and browse for some more ideas.