In the slim width, the instructions are to cut panel 1 into two pieces...This had me quite worried at first as this only leaves but a sliver of panel 1 with which to attach panels 2 & 5, all the while trying to keep things absolutely square.
This is where the panel-cornering jig feature of the MFT saved my butt. Locking everything down to the table, it was no big deal to sink screws into that small piece. Once attached to a larger piece, it could be placed back up to where it needed be with much less fuss. At the end of the day it was only 1mm out of square over the entire 14" width, without the second side in place.
Sharp eyes will also notice how perilously close I came to blowing that first round of screws in the corner jig through the outer layer of panel 5, as I forgot to add an 1/8" to my combination square (my typical overhang allowance) when striking that first layout line .

You can actually feel the shanks through the veneer. Too damn close.