Good decision. Keep the existing wood and have a new one made with the existing iron. As for making forends for SxS's, , my personal experience was that they were simpler and less demanding than stocks. That said, I've only made a few and those were for Fox SW's. Those had simple iron and fit and were for extractor guns. The one pictured has a bit more inletting, especially the tang at the latch. Ejectors could complicate things more.
I will admit that the forend I'm working on for a Superposed is turning out to be a real bear. I hope I never do another one. A lot more complicated than the stock.
