Thanks Revell-Fan, but the error wasn't "not in scale".
This project started long time ago and i added many incremental variations that pusched me to redo many time and in different way the build process of the single subproject. And now ... i sometime don't remember which process i applied or which was the best.
In this case, the very first page of the instructions, I didn't remember that it's better to start from the platform of the MLP, then put the pillars below and finally glue both on the rampants.
Now this is the corrected version, not completed yet.
It's a long trip in front at me.
Best, Nando