The GP20 was rebuilt into GP7, GP9, and GP18 configurations which are currently sitting unused until I can develop sounds, engine specs, scripts, and pretty much everything else besides the model for them. GP20 will return after GP30, GP35, and SD35. That order can change though depending on my level of interest and what people would rather see. I've stopped giving out ETAs since every time I think I am close to being finished I find a hundred things I can do to make it better.