This particular platform is technically a full sized platform, however, as you will see in the next couple of days, it's actually the first step in a fabulous twin sized bed with storage. This can be used as is for a full sized mattress or can be built to accommodate a twin after the second phase is constructed! Plans for the Storage Component can be found here
I would like to mention that this project has many aspects that can be modified to taste, kind of like food... You can opt for bun feet, or something a bit like I have done above, a spindly leg...you can choose to use molding instead of 1x2 trim, and you can decrease the width of the perimeter boards and attach half round trim to the outside edge, or keep it simple...This is meant to be adaptable to fit your home's decor and furniture style. You will have these options all the way through this collection as far as trim style and the level of decorative features you choose to add.