New Sketch-Up Model

So I have been playing around in Sketch-Up in order to create models from my redesigned model scans. The following are a few printscreens of my play arounds: 

These printscreens below show a continuation of the above model in which I have put the models back to back to create a new shape.

I then progressed to the next four printscreens, however the model was too large that it crashed every time I opened it. Therefore I will not be progressing with this complex model any further.