Nice! I see those basketball games on ebay from time to time; they are sometimes listed as "Electronic Readout Systems". I'll look for a cheap one.
I uploaded info on Tiger 7-in-1 Sports Stadium: http://www.seanriddle.com/tms1400.html#7in1 Note that the source code lists it as having MP7303, but this one has MP7304. The die also got stuck in plastic, so the top metal pic is ugly. But it whinked up nicely. I don't think I got the overlays, but I'll double-check.