When standard designs are 'not big enough' but you want something to last until or when you reach megabase stage.
Basic rule is the ratio of raw to smelted product based on Yellow belt count. Blueprints have descriptions about relevant Throughput rates, Fuel, and Power demands where simple belt counts do not work. Solid starter base automation encouraged for material demands to set up. Electric options are beacon free because we have plenty of space to work with, and landfill if we don't.
To modify for Krastorio 2, simply change input belts to reds, as the ratio is a flat 2-1 until enrichment. Variance in the map colors are from the enhanced map colors mod.