Cupboard shelf

When I wanted to do similar on a previous caravan I bought some suitably sized facia board as used to clad existing house fascia timbers. Came in different widths and colours with a hockey stick profile. Light, easy to cut and rigid

A sheet of ply-wood and a tube of no-nails is your friend 

The beauty of the fascia cladding was that it was easier to handle, available in a range of widths - one of which was ideal. Just needed to cut to length rather than width as well and easy to store spare length. Also did not bow under load as twin wall. No need to seal, smooth faces.

I once put an extra shelf in a cupboard using sick on Velcro strips. The reason was I wanted flexibility and the ability to remove without any signs of modification when I sold on. It worked! 

I used some plywood and some pine edging, after seeing how much the matching stuff from Swift would cost!

OH stained it to match existing shelves, and applied varnish.  Been in use 11 years now.

Our cupboards had bits to take a shelf, just not a shelf supplied for every cupboard, I made 3 extra ones.

I've made some supplementary shelves with mahogany fiddles from my carefully hoarded stock of ply and timber from my boating days.

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Various colours and timber grain effects, 6, 7, 8, 9, 10, 12, 14, 16 inch widths and various thicknesses and cheap! The 10mm thick, 225mm wide, in white is about £11 for 5m length.

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