I have not used spelt in the past, so I thought I'd give it a try. I made up a sourdough formula that had 40% spelt, with 50% bread flour and 10% rye making up the rest. Hydration was approximately 77% The loaf turned out pretty good, the flavor was nothing distinct, tasted like a whole wheat loaf, with moderate rise and an average crumb.
If you have a favorite spelt recipe, let me know in a comment or link to it. I have plenty of flour left and would like to explore using it in some other bakes.