Sketchup Progress

Below is a screenshot of my sketchup model so far. I've had a problem creating a perfect screw for my stairs to descend down with it's slope. Will seek help in next class and hopefully someone could find a solution. I followed this tutorial on youtube to create the screw. Problems started to occur at 1min20seconds as i could not scale down the 'screw' perfectly as seen in the tutorial.

As my design below ground would have a 'mechanical' theme. My idea was to create this screw and have my steps descend along its edges.

Objects are everywhere as i haven't finished creating my above ground design but it's on the way! at the moment I'm just create parts that will form the end product. Will attached them once complete.

Progress week 3