Wackersdorf kart track

[NaN]

how assign normal maps and specular maps ?

You can provide material and normal maps. Just call them xxx-misc1.png, xxx-misc2.png.
misc1: rgb: fresnel reflectance value at zero degrees, a: micro-scale roughness
misc2: rgb: normal

For example WALL1.png, WALL1-misc1.png (specular), WALL1-misc2.png (normal)

must I modelise planes and assign skidmarks textures on it

yes

Will it be possible to simulate a complete race week end (practice, qualifications, race) ?

It depends on how complex/configurable it is expected to be. Adding an optional qualifying sprint(all at once) before race shouldn't be a big deal.

possible to change setups on car ?

How would the gui look like? What settings should be available for modification?

possible to make race against 34 karts controled by AI ?

The maximum I've tried have been 8. One could try to get 16 to work. How would the gui look like, opponent selection, list?

possible to assign a starting position for practices and qualify

One could add support for alternative start positions. For reversed tracks the start positions are simply rotated by 180 deg atm for example, which is not really optimal.

And do you think we can show different pictures or animations at end of the race ?

There is no support for animations in the engine, although joe files support frame-based animation(not enabled). Someone would have to implement it.