We used the left over leg material to do the appropriate measuring and fitting.
Once we had the side boards cut to there correct length, we clamped them in place and using the Kreg Jig, we fastened them in place. The Kreg makes life so easy.
Next step was to sand everything down (which meant I had to get a new sander:)). We got most of it finished however there is one place I will have to use a little wood filler on the end of the door.