Ok thanks,
It provide better stability I guess. Using only one technic bearing plate make it shaky.
The other interesting thing about this Build. Because it's not really made to be build, they use very weird style. There is almost no brick. Everything is dislocated in plate or something. For example on the wing, you mostly use ROOF TILE 2x3 and 4x3 instead on only 1x3 (maybe it was because of your lack of part). It make the render really weird IRL. In CGI there is no problem since every piece can be perfect. So you don't have really a gab beetween each part and sometine a slightly different reflecion or coloration. So, it may be not worth following exactly the build. I'm impatient to start building it to see the difference with yours.
Btw, are you from France? I saw some So Ouest Lego Shop picture on your flickr.