#2 looks like a leg from a Tri-pod Laser Canon
#7 looks like the main chair piece from the Millenium Falcon
#8 looks like a canon from an ISP-6 mini rig
#10 another leg from a Tri-pod Laser Canon
#15 I don't have mine handy at the moment but it might be the cockpit seat from a Snow Speeder
#16 I don't have mine handy at the moment but it might be the cockpit canopy from a Snow Speeder
#17 looks like the rear exhaust piece from a Snow Speeder
#18 ramp strut from the Millenium Falcon
That's all I can help with at the moments.
Edit: looks like Stefan beat me to a few of them.