Step Five
Well by now we're all proficient carpenters, Right? The next steps will become a little more tricky. I hope I can explain them well enough to follow.
OK, go ahead and attach the front piece of 7/16th OSB to the floor, just like you did the back and ends. Now get your self a couple of 2X2s, or rip a 2X4 in half. You are going to use them to connect the front to the two ends FROM THE INSIDE! This is different. Cut both of them 74" long. Stand one up in the inside of one corner and screw the end to the front into the 2X2 FROM THE OUTSIDE. Like this.
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Go ahead and screw the end OSB all the up to the 2X2 making sure to keep it straight.
Now, take an 8 foot 2X4 and rip a 45 degree edge off of it, like this, the full length of the 2x4.

Now attach the 2X4 from top front corner to top front corner with the flat side of the 2X4 facing out, use some longer screws, I use 3" sheet rock screws, three in each end. Like this.
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OK, now you have all four sides firmly attached to each other. Go ahead and install four hinges to the door and then finish cutting it out. Remove the temporary screws from the bottom and your door should now be working. Cut three pieces of 1X4 to attach around the out side of the door for trim. Start with the hinge side piece first. But this piece tight against and over the hinges. Screw all the pieces of 1X4 trim to the OSB once again from the inside. Allow the top 1X4 and the 1X4 opposite the hinge side to extend 1/2" beyond the door. This makes for a door stop and covers the saw cut when the door is finished. Like this.
