LM2575 switching regulator - ideal inductor and COUT sizes
Without spending a lot of time on this, there simply do not exist parts in that package size (0805) which match the electrical requirements for the inductor or Cout.

You do not get to pick the package arbitrarily, you must look to see what packages are available and practical, and pick one of those. That part will have a part number and manufacturer, and you should list that on the BOM (Bill of materials).

For example, you might choose an aluminum polymer part for Cout such as the Panasonic 10SVP330M, which is 8mm in diameter and stands 12mm tall. There are several technologies that could be used for the capacitor and multiple manufacturers, and you should pick at least one specific one ( preferably more than one ) and design that in.