Plodding along ....
I prepared the last parts to complete the rear end of the model and also the chassis mounts for the fuel tanks.
My knowledge of truck parts is limited, but I made up the mounting rails for the 'box/plate thingy with a storage box thingy hanging off it thing', that hangs off the back of the sleeper cab!
A little trick I use when making up long square tube type parts, is to glue the long edge seam with the parts folded in the flat. Once the seam has tacked up, but before it dries, I apply light pressure across the folded seams and the box shape will pop into shape. Do this before the glue dries, because if you had any glue seep into the part from the glued tab, the part will glue itself together.
Doing it this way, I find once the ends have been glued, you end up with a nice straight part.
I used the same method for the other parts
The mounting rails and two parts on the other face were attached in the flat, before the 'box/plate thingy with a storage box thingy hanging off it thing' was made up.
I measured the distance between the inner rear and front faces of the 'thing', and cut out two strips of spare card to this measurement, 4mm wide. The strips were then roughly folded into a zigzag pattern. I glued the long edge of the 'thing' part in the same way as above. I glued up one of the side faces but left the other unglued. I then stuffed the two zigzag strips into the cavity from the unglued side. I gave the part a good shake to spread the zigzags a bit and then glued up the remaining edge face.
Hopefully this will prevent the main faces of the 'thing' from bowing. Also it made the part stronger for applying pressure when attaching the part to the model
I could of laminated the inside with card instead, I suppose, but I didn't want to make the part too heavy.
It came out nice and strong in the end.
Now it's time to start gluing on all the sub-assemblies to the model......
I glued the 'thing' to the back of the sleeper cab. I stood the model on its nose and let gravity hold the 'thing' in place while the glue dried.
'The Beast' watched on with the desire to visit the worktop.......... No chance!
Once the 'thing' was dry, I glued on the storage boxes in front of the rear wheels, completing the rear of the model....
Nice a$$ !!!
The fuel tank mounts were then attached to the chassis and then the exhaust stacks were attached. Nothing special there.
Finally, the fuel tanks were attached, completing this stage of the build.
Optimus is now starting to look the part .....

I'm not happy with the roof sides of the sleeper cab though. I'll have to try and sort them somehow....
In the next, and I think, final build post of this thread, I will be finishing the front end of the model, including the cab running lights, sun visor, rear-view mirrors, headlights and front bumper......
See ya'll then !!
