All credit to http://bruxnboggle.com/forum/viewtopic.php?f=16&p=18404
Step 1: Cut
Cut out 7 squares of fleece. I chose 9x9 inches each. (I'm making a few cubes) Then cut four strips to hang the cube with.
Step 2: The Entrance
Cut a decent sized hole in the front of one of you side pieces. It may be best to find a bowl and make a little pencil line on it. (Or use permanent marker and cut around it (cut it out so the marker doesn't hurt the rats.))
Step 3: Sew
Make it inside out first. Stitch around the entrance hole. Then sew the sides to the bottom. The bottom is two ply. Then sew the verticals. Last, sew the top to the back (opposite the entrance) then put the handles hanging on the inside on the sides and see the top to the sides, trapping the handles in between. Sew the top piece to the entrance piece. Trim edges if necessary Finally, pull it inside right thought the entrance hole. Yay! You are done.
Step 4: Tips
Add a piece of cardboard to the bottom inside of the cube and lay a piece of fleece on top. It will give the ratty more stability. Make a smaller cube if you want. Mine ended up very large, but I have two huge (and growing) male rats.
Step 5: Enjoy
Watch your rats "hang" out in the little home. They may like to lounge on the top too. Will add pics of my rats shortly.