In my current house, I don't have that kind of free wall space, so I need it a bit smaller.
Not being one to waste materials. Out of one 4' x 8' sheet of melamine coated hardboard I can get three 32" x 48" whiteboards. So lets get to work.
Step 1: Gather tools and materials
qty description price
3___1"x4"x8' standard pine board_____~$1.54 each
1___4'x8' sheet of tileboard (melamine finished hardboard)____~$9.93
24___1.25" long course pocket screws
1___bottle of wood glue
picture hanging hardware
power miter saw
Sandpaper or an Random Orbit Sander
Pocket Screw jig
12" Quick Grip Clamp
2-5' pipe clamps
Step 2: Start the cutting
Next is time to cut up the frame material. The first cut is to rough length, so crosscut the 8' board into a 3' piece and a 5' piece. The second cut is to rip the two pieces in half, so that you have all four pieces of the frame. Since the 1"x4" is really 3/4"x3 1/2", when you rip it in half it won't be 1 3/4" but more like 1 5/8, or maybe even smaller. It really depends on the kerf of the rip blade you are using, more then likely it will be 1/8". So make sure to adjust your measurements.
TIP: Cut all the pieces before resetting the fence.