So much to do so little time, for now at least. Steering wheels are done, thread is still to be applied, the most time consuming job as I decided to cut grooves out, giving tires a bit more life, or just to practice precision cutting. I did not change anything within wheel/tire construction. Main wheel has been assembled using two side cover rings, ribs glued vertically between them and edged. Assembly diagrams are missing parts (20b), (20c), both should be put together into inner edging strip, with colour inside. I had some trouble with fitting axle, as part itself was not long enough to get desired diameter (bottom of the axle was fitted to the rim, and top was left loosely rolled). 
Tires are tricky part, as convex shape is to be applied on previously rolled round tire ring. Before cutting middle section of each tire, I used marked centre as point for compass to transfer shape line to the other side of card. Then, using the same centre, with olfa circle cutter, folding line has been cut (also see here). With that done, middle section has been removed. Next operation was shaping tire up, by applying pressure on rather soft surface (back side of any mouse pad), by round pin or other tubular device. When ring was rolling on its own, I gently folded middle line down, in small sections to avoid creases and cracks. Tire ring turned out too long, so I had to cut it down by 3 - 3,5 mm (tab was not required)
Browsing internet for references I found this movie on YouTube, very interesting for it subjects, in my case some past and some future projects, both plastic (1:35) and card (1:25).
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