> I would have to wait another endless days till I have it back again

We do upgrades the same day the player arrives. Shipping from the US (as an example) takes 2 days to us and then 1 day return. To and from Europe is next day both ways.

> So maybe someone could tell the size of the Mk2

Check the dimensions of the Mark 1 at our site - the Mark 2 car cage is almost exactly the same, but the wiring loom is much more flexible so that helps if you have a depth problem.

Rob