Cesare
Thank you for the link it was very interesting.
On the rear tyre, why not move it up higher so that it is centred on the sandshields and then lash/tie it down with several loops of rope. It need to be fixed in such a way that it does not swing around.
On the colour scheme, I have have noticed several discussions going on this site and other sites. What I notice is that each patrol in the LRDG had its on particular scheme for themselves. As a result the variety of schemes would appear to be considerable. Some would have bee sprayed some hand brushed. It really depends on what scheme you pick. Have a look at some of the LRDG sites this one gives you a basic understanding
http://www.lrdg.de/vehicles2.htm
I hope this helps
All the best
Fred