Nice one Franck,
I remember some discussion a while back about feasibility of using a Mini on 15in gauge, 2ft is still a bit tight. I suppose it could just be a mini body fitted on a conventional railway chassis. It would not be too difficult to lift the body up as they are not too heavy. The Canadian ones are on standard gauge. The Land Rover narrow gauge conversion in the UK shows how it can be done on narrow gauge, and I love those Romanian conversions. I sometimes wonder if they got the idea from narrow gauge modelling.
One of my projects is a narrow gauge railway with rail mounted Japanese road vehicles. I started a while back, but I hope to use them on a new mini layout.
Those 1/12th scale models are not that cheap, a bit too risky for me.
I used to have a mini that colour , same model, the original 850cc engine, which was better than the later 1000cc version. Even fully loaded with 4 people in it it could easily take on other non sporty cars, especially on hills. The modern re-incarnation of the Mini is not a real Mini, whereas the Citroen C1 I have now has a lot of the qualities, with many improvements of the old Mini.