Some rosewoods are toxic and both ebony and rosewood are difficult to finish. I have seen rosewood stocks and while unige they usually contain little figure. I suppose if you can find rosewood or ebony of sufficient size to make a gunstock and with grain flow that can be made to work a stock could be made. It would weigh consierably more than a stock made from a nbice piece of walnut and would likely be more brittle. It would be difficult to finish as these woods usually are. For these downsides it would be made of a fairly plain grained wood, though quite unusual... If you can big these woods back with you they would certianly be useful, mostly as pistol grips, knife handles and stock accents(tip, caps, etc.). If importing for that use get the best figured planks available. With ebony there is usually little grain pattern but some species have streaks of contrasting colors. The best rosewood has streaks of dark choclate or black swirling in a dark red/brown matrix. They sound beatuful, but these grain patterns would cause a lot of trouble in the forearm or grip area of a stock. Not going to say it can't be done but it wouldn't be a simple project.