Baseball DIY

While shopping at Target today for Lincoln Logs (I erroneously thought they were Linkin' Logs) for my nephews, my desire for a Lego-like baseball stadium toy line rekindled. I want something where you buy a big bucket of interchangeable parts: seats, outfield walls, scoreboards, press box, various vendor booths, bunting, etc. The field would be on the base board, and you could angle the walls however you liked. You build whatever you feel like building that day and leave it set up until you're ready to build another one. I could spend hours or days in this fashion, and I never played with Legos.

I'm also looking for Strat-O-Matic, so if you know where I can find it, please point me to it. I've heard good things about this game, but I never have played it. Are there any board games where you can play General Manager and simulate seasons, something along the line of Risk-for-baseball? I know you can do this with video games, but it's not the same.