Thank you for all your comments !
Painting and assembly took like 30 or 40 hours, but I had to be sure that all my surfaces were pretty smooth before painting, and that was THE boring part of this project for me, because it took even more time than painting and assembly and it was never perfect ...
I already have started my new model, and I think you'll like the concept, more technical than esthetic this time. It's a launch model (so the most part of the model is a roller coaster station and a second part is a rising track). The propulsion is made with a pusher car below the track on a 50cm segment. Once accelerated , the car goes to the top of the curved track so it turnes back. Then, a brake system brakes the car, and a system made of wheels puts back the car at the beginning of the launch segment.
I'll open a new topic to illustrate that because it can seem mysterious for you right now ahah. So for this new project you'll see the evolution of the work !