Full Over Full Bunk Bed

I am planning on moving to studio apartment (which is one big room), but want to denote the bedroom area by building a platform for a full size bed. I just want a couple extra feet.
Any ideas on materials? Cost?

PLATFORM BED MISSION FULL SIZE w/ HEADBOARD CAPPUCCINO

$349.99

Bedroom Black Double / Full Size [...]

Twin, full, queen & king are all terms we’re familiar with. These are the standard sizes used throughout the bedding industry and are typically the most available. For most folks queen & king size beds tend to be the most popular sizes not because of the width of these beds but because of [...]

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Large, 30″L X 30″W, taupe bed. Easy to use portable bed opens and closes in one simple motion. Extra thick ballistic nylon cover with reinforced corners. Made with a sturdy tubular steel frame & durable resin feet. Bed includes a matching storage carry bag for quick access. K&H Breezy Bunk Portable Dog Bed [...]