This is fairly close to standard other than I raised up the sides and footboard 2" from the plans. I also used a plywood platform in place of slats and a standard box spring (there are 3 2x4 supports under the plywood). This saved some money since we just bought a king size Casper mattress and we prefer the look.
The other modification is that I purchased "bed rail fasteners" from Amazon. These "clips" enable us to easily disconnect the side rails from the headboard and footboard (like you might find on a purchased bed frame) for when we decide to move or redo our floors or whatever. I thought that was better than having a semi-permanent connection with screws.