Thanks for the thoughts.
I couldn't really figure out what to do with the pitching rotations. Each team has 7 legit starters, and you'd like to give them all enough work, while still giving most innings to the best of the bunch. No 7-man rotations, so maybe I manually rotate the fourth starters and below for a work around? There's probably a better way to do this.
I picked ages based upon their peak years. Because I have player development disabled, the age thing is basically arbitrary. It's basically a field-of-dreams fairy-dust concept, with each player at his best at all times, rather than a development league. You'd have to tinker a lot to make it into one.
Uniforms? Hey, if you're buying, I suppose...