Textures are drawn on map entities at a set rate. If you change the scale up/down, the textures will repeat more/less times. At one size a room may look small because the bricks and windows are in proportion, but if you scale the all models up, the bricks will be small. In a chess game you probably use mostly models so there's no difference.

Of course if you resize the bitmaps you'll be okay even with level buiiding. There's also a matter of decimal places also but I've never run into it as an issue (in my small experience). Scaling models can also affect collisions.