We've opted for 18mm melamine faced chipboard (MFC) in 'Kaisersberg Oak' from Meyer Timber . It comes in a huge sheet which we hope will be enough to do all the walls, and is cheaper than the products marketed as 'furniture board'
We templated the walls in OSB first...
And here's what it'll look like with the ambient lighting...
Before tracing the shapes onto the giant piece of MFC.
And cutting them out using the jigsaw...
Here's the panels in situ. Edge trims are still to be fitted. The large cut-out at the top is going to be our herb garden and the little oval cut-out is for our surround sound speakers.