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The % sign means - part with this number goes here. Number 8 is the large part that goes from the nose to the back, where it connects with 1a - that's the part in the last picture. Foldlines are ended with a triangle or a circle (marking if it's a mountain and valley fold). The red line on the parts from that page is just to help you line up the parts against each other, because all imperfections in this stage will carry to later stages and affect the look of the model.
As Peter says, if you ignore the thickness of the paper in the inner structure, the parts won't fit together properly. Some parts are just details slightly raised above surrounding surface - you can ignore it there, but it won't look properly then (F28 for example).
As for adding thickness - use the paper from food packaging boxes for example - that's quite often ~0.5mm thick, and glue the part on top of it. Regular printing paper is about 0.1mm thick, if you need 0.3mm for example, just glue 3 pieces on top of each other. But in my experience, by little scavenging around you can find paper with various thicknesses easily.
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