Thanks a lot guys for your compliments ! I was thinking for a long time that project and surely this technique can be evolved more in details.The secret of the wheels is shown at the photo below.

Motorcycle was build at the rear wheel on a screw from TAMIYA figures kit.
Penta , the same idea I had for the kerb.And now is painted as you say , but photoshooting is not my advantage ,that 's why I didn ' t take any new photos.
Sorry that I ' m not writing comments at forum but I find very difficult writing English.