There is also a very popular Sci-Fi convention in Atlanta, GA called Dragon*Con that I like to attend every year. For Dragon*Con 2012, I decided that I wanted to carry my everyday items around in a TARDIS. So this is the process I went through to create my TARDIS backpack.
Step 1: Creating the body of the backpack
The first thing I did was decide how big I wanted to backpack to be. I created 5 squares: 1 for the bottom, 2 for the sides, and 2 for the front and back in Inkscape. I then cut the plexiglass with a 40 Watt Laser Cutter. I taped the 5 pieces together to form the main part of the TARDIS.
Once the box was taped together I used acrylic glue to glue it together. The box dried for 24 hours and then the tape was removed.
I cut out another piece of plexiglass. This piece was the same size as the bottom piece except it had most of the center gone. This center section is what allows me to get in and out of the backpack.
I glued this piece to the top of the box.
I then created another smaller box for the TARDIS light and glued that piece to a smaller piece of plexiglass for the top of the TARDIS which fits into the center section that was missing. This piece also dried for 24 hours and then the tape was removed.
I then attached the hinges and latch for the top of the box.