i just bought a king sized bed frame with the intentions of it being platform..... but come to find out i still need a box spring. so im wondering can i buy a metal platform to put inside the frame i just bought? pictures below of the bed i just bought and the metal platform i would like to use.... this is my first time buying a bed so please help.... i really don't want a box spring...

and im guessing this is how it would look.... has anyone done this with their bed??