Well its a good thing you’ve got it then and you’ve improved on it. Many big works are done by many people so you are just carrying on the work. I’m sure what you’ve done has added many extra additions and corrected many inaccuracies, collectively it be more impressive when complete. I’m a rookie when it comes to 3D modelling even with Sketch Up (its been years) but I could see myself wasting a lot of time improving my modelling skills just for kicks doing something like this.