Dont really know what your wanting for a out come with your project. Are you matching whats already there or gutting everything and starting fresh. Maybe try a hard wood dealer in your area for the bulk of items and the trim pieces can be bought at most marine part stores ie. West marine, SD marine exchange ect. What I think works well is to get marine ply and glue down door skins which come in hundreds of grain patterns.
Sure wwish I had a pilot house the climbing up and down is getting very old.
Good luck and lets see pics of your project