I've seen Dougs propellers and you are correct they are excellent and for the labour that goes into them represent good value, but i'm sure you understand this Des there is a far greater degree of satisfaction obtained from creating something from scratch as opposed to buying something ready made. If that wasn't the case then we would all stop at diecasts.
It could be an absolute failure but the wood has cost me £3.50 and I have all the tools already so all that is lost is time, if it transpires wood and I dont mix then I can always resort to plan B.