If you don't choose a traditional frame, there's a very easy solution using a magnet and a metal disc. Stick each disc to the wall (using masking tape or painter's tape if the wall surface is delicate) and hold the Hanji in place with a magnet.
Since hanji is a handcrafted paper, the texture, especially visible on the edges, adds a characteristic charm to this paper. For this same reason, the dimensions are approximate, within a few millimeters.