My project is restoring two Victorian houses. I haven't found it uncommon that the bottom sash are rotted at the corners. Every house of that age I've looked through has the problem -- maybe Indiana is just home for the rot fungus.
Construction-grade wood from the lumber stores is obviously not good enough. Antique Heartwood Pine would be great, but $600 a sash is way past my budget. Replacement or insulated windows in a Victorian house are what I call "flipper damage".
As you may have noticed, I'm a beginner at woodworking of any kind. So there may be a source for 8/4 white oak or better grades of white pine that is obvious to you, but I've never heard of. The local lumber stores haven't heard of it, either. So let me know where you would get oak, pine, or fir that's good enough to make sash from.
The molding profiles are mostly Roman ogee, with some plain bevels and some fancier reverse curves.
I have been having sash made at a shop in Indianapolis. They never fit the window, even though I brought in the originals to measure. Surely it's not good practice to shim or cut down sash except for an out-of-square frame.