Step 2: Pick a design
As I said earlier, my son wanted to build a HMMWV. So, we did an image search on Google for an M-998. We found these illustrations from the military training manual for the HMMWV. We decided that a "fastback" design would work best for my son's plans, so I added a couple of lines to the design.
We then printed out our design with a length of 6.5 inches, since that size best fit our block of wood.
Note: Make sure that your design meets the specifications in the rules. You may also want to check to see if there are other restrictions imposed by your pack or counsel.