It has been up almost 20 years now and the wood is fine. The drawbored mortise and tenons are still as tight as the day I put them together and it is a heavy gate. In the Spring I'll be sanding it and painting it again. The only thing I would say about sapele is that it does expand and contract quite a bit across the grain, so this time of year the gate tends to stick a little.
Andy -- Old Chinese proverb say: If you think something can't be done, don't interrupt man who is doing it.