first of all i am getting closer to the result i want 
i tri to blend this rail in yellow but its hard first of all you can hardly see what you are doing because off the very small manipulators (i name them) but on the other hand if you think everything is oke than the render program will do the job and you can start all over again -:(see first picture)
i am happy with the result for a newbie but it can better and second i am not finish yet -
here is the file i hope somebody can help or put me in the right direction
blending.3dm (6.7 MB)
greetings peter