The Ultimate use is to use as a normal computer.
No, the larger challenges is to make everything fit in an area half the size of a mini tower, make it still look like a radio and maintain cooling under any load. Then to cut holes exactly without mistakes and drill holes in the base Template exactly to mount all hardware, as you only get one go at getting it right. Using normal size hardware is the challenge in such a confined space.
Everyone has their hobby. Mine is building computers.