Here's an up close look at the fiendish schleim at the heart of the PP 1444 X. It did bend MY mind. Your mileage may vary. This was another outside-in build so it has been rebuilt several times, I may yet work on it some more. If you do try this at home please beware that this design is prone to sudden catastrophic disassembly until it is complete.
I've been asked what a unit is. The unit of which I speak is one sixteenth of an inch. A one-stud brick is five units square by six units high (plus a stud). So a plate is two units high (plus a stud).
You may notice the partially completed forward end block on the upper left. The indicated tiles and plates are very useful in preventing accidents, again.
The preparation for assembly. Time for steady hands. Yes, you are indeed reading the 'paragraph on the back' of each of these (nominally) 8x10 glossy photographs.
Here's some of the math. Geometry really. The missing arrow would point to the dark space between the beam above it and the partly visible gray plate to its left. These tiles are 'place holders' since they don't connect to each other, but they transfer the pressure of assembly through to the other side, thus preventing assembly from becoming disassembly.