yup so i made one out of the box they gave him to me in!:D im sorry if you don't understand the steps. they're all in the wrong spots because i couldn't get pictures to upload and it wont let me move them. im not very good at explaining things either but i hope you would enjoy:)
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leave the sewed areas out
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one for each side and cut through the box too. hot glue a peice of plastic with three wholes punched in between them.
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cut out the windows through the fabric and use the one extra inch ontop and rap it over the cardboard edges.
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cover the flap with fabric.
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rap the bottom like a present and do not hot glue the flaps.
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make the straps(sorry i couldn't find the picture for how to make them anymore)
1.) http://tinypic.com/r/33js7kp/6
2.)http://tinypic.com/r/2605y1h/6