After probably too much track design planing i've finally decided on what i want and started building.
combining all the suggestions with the original design i came up with this track layout:
the track is broken in half so that it can be moved more easily. major grid is 50cm and minor is 10cm. The black numbers indicate the radius and the degrees of the turn, the white numbers indicate the length of the straight (in cm) and the red numbers are the elevation of the track. t