Im in the process of making some new ones myself Bill.
I will be using 2mm mdf and also doing a couple of layers of glass over top to add some support and also help with the moisture issues.
I had a look at the ones on EBay and i would save your money, what they wanted for postage will get you the materials locally and im pretty sure you should be able to find the right tools down there someone in that shed of yours
I've just finished making a mould for the armrests but im not happy how this one turned out so will be doing another one to make sure its up to my standards. I looked at a few different ways of making the armrests and figured this would be the easiest option for me and also the least time consuming.
Its also easier to punch out more when needed than making them from scratch if i was to use wood or other materials
Look forward to seeing the new interior once its completed, hopefully give me a few more ideas as well.
Cheers Ben