Go on Slippy, you know you want too ...
I tend to post a lot of pictures during the build process, so this may all seem a bit dull. It's really to document everything as much as possible.
High density foam has arrived:
Flint grey material (it's important that it's sent rolled and not folded - the creases are very difficult to get out):
1 large sheet of MDF cut into 4 (£20):
4 pine strips £2.14 each)
30mm and 40mm Turbodrive wood screws (very effective in MDF and worth the expense - £9.86):
I'll have some lunch and then start measuring. Wish me good luck!