Airfix Tiger 1 Starter Kit 1/72 scale model Part 2: Prime and Paint - using just what's in the box!

Unboxing and build (in real time) of Airfix's Tiger 1 1/72 scale model kit, Starter Set.
This is a challenge to build, paint and weather the kit using just the materials in the kit (the glue, three pots of acrylic paint and the brush), and no other specialist modelling tools.
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Usually I would use filler to fill any gaps (fortunately there weren't any that needed attention), sanding them down using a range of sanding sticks, then give the model a spray of primer. However, as none of these were in the kit I decided it best to just give the model a wipe over is IPA (Isopropyl Alcohol) to remove any greasy deposit from the moulding and build process. However, this could easily be substituted with some water with a little washing-up liquid in - so didn't consider this to be breaking my self-imposed "from the box only" rule.
I would usually prime in a light colour - usually a non-descript light grey, but only three pots of the acrylic paint were in the pack, and the lightest of those is the light brown colour (Humbrol 93), so I was forced to use that.
The most common mistake (and Airfix make no mention of this in the instructions or on the box where the painting guide is) is that the paints require thinning. This can be done with water straight from the tap. I used a little bit of sprue as a stirrer, and slowly topped up the water level until it was thinned to a good watery consistency. I then painted a thin layer onto the model.
NOTE: Although I am using the paint the model will be coloured with, it is important to think of this later a primer layer - the colour is a coincidence!
It is quite a rough layer, in that brush strokes are visible. The plastic colour is similar to the colour of the paint, but if it wasn't it would be clear that the layer is thin! Actually, despite the brush strokes the surface felt smooth to the touch one dried.
I then decided to use the black colour to do some pre-shading. Again, this was thinned used water, and thinned down a little more. Using the brush (not airbrush) I painted black on the areas that would be in shadow, or dirty due to exhaust and wear and tear.
Three more thin layers of paint were put on. This slowly built up over the black pre-shading. Eventually getting to the stage where the black was just visible, but not with defined edges. The black was also used to paint the detailed items moulded onto the Tiger 1. Once dry the light brown was again used to neaten.
Just to recap, the layers used:
Layer 1: Primer (could be any colour lighter than final colour)
Layer 2: Pre-shading (very thinned black)
Layer 3: First coat of main colour
Layer 4: Second coat of main colour
Layer 5: Third coat of main colour
Layer 6: First coat of black for details
Layer 7: Second coat of black for details
Layer 8: Highlighting metal parts of details
Layer 9: Neatening using main colour
As you see this is why thinning the paint and using many thin layers is important. Even after all these layers non of the engraved detailing was lost.
Regarding the tracks, The instructions say to use the metallic paint (Humbrol 53) on the tracks, but this is far to light. Therefore the tracks were painted with two coats of black (Humbrol 33)