P.S. I thought I should mention, since you're going to be using Irrlicht (which should be 100% legal), you should go the rest of the way and remove the ripped GTA media from your engine samples. Otherwise you could get in big trouble.

Basically, just remember that you're not allowed to profit from others work unless the license agreement allows it. Blitz3D doesn't allow this, but fortunately for you I believe Irrlicht does.