I thought about this, but the boat is only small and I think adding more finishes will look messy - it's one of the reasons I removed the current "van carpet" effortWhy not use a piece of black plastic for the instrument panel? This is quite normal and many builders do this.
I did the same - 30 years ago, but not sure they are available now. I still have one sapele door left in my 1970s house. Rest gone either completely because of modern open plan or replaced with solid wood.I used sapele door skins that are sapele veneered 3mm ply. A couple of quid each from the wood yard at the time. 30 years on and still good. No doubt the price has risen since then! Have you looked on Ebay for off-cuts?