This was over at the Hive, but I'm going to bring it over for our dedicated mappers. Not mine.

Basic Hero Creation (Veterancy): http://starcraft.incgamers.com/forums/showthread.php?p=31756

In addition to simply using veterancy to create an exp system, you can use it to increase everything of a unit with level - stats, sight range, etc. Very handy.

Although the unit's stats are all set to 0 and disabled(except for hp), when you create a new level in the veterancy behavior for most units. It's quite retarded and makes it much harder than it needs to be.

Or here, .