I wanted that my track withdraws against the wall to win some place.
Dimension is 3m x 1m70
It's very heavy but it's possible to withdraws the track alone.......

Here is where i'm in . I used the dremelsaw technic. It's very easy.

I'm not sure how to make lane change. I tried like this :

By leaving a space of 2cm. it is look like ok....but perhaps there is a better solution ?

Thanks for your help!!

Bye