I think if you played with the wings, made laminar flow wings, and made sure the center of gravity was established, with the proper angle of incidence, up the canards angle a bit, you would have an excellent workable flying model that would really glide well.
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.