I know this sounds similar to Mountainhome% but in reality it's quite the contrary. In Metropolis% you must grow your fortress to 140 population whereas in Mountainhome% you must get a monarch (Which can be achieved by choosing a dying civilization) then constructing the "true throne". I think Metropolis% would be an excellent test of Dwarf Fortress’s fundamentals opposed to Mountainhome% which relies heavily on world gen RNG. Here is what the rules could be:

The run must be done in an unaltered version of Dwarf Fortress. Game frames-per-second cap must be set to 100. Sow frames-per-second must be set to yes. All difficulty settings must be set to default The run must be done in a world created using Basic options. Time begins when you click Fortress. Time ends when your fortress gets the title of Metropolis.