does anyone know how to, from an existing gam eengine, take it, make it its own EXE file and then add to it with elements from other game engines? so then its at a stage where i can add teh models, and other graphics, art and sound etc? So from that its like making a MOD for Half Life, you hjust add yer own models etc. If you want em to explain further, ask.

You would need to license a engine to do that, thats what licensing engines is about.