Just a quickie - why are you using multiple instances of the plt sprite as a platform when just one would suffice?
Also, did you intend each instance of plt to have an angle of 0.531?
Regarding event sheets - I'm a great advocate of using separate event sheets for individual mechanics (such as collision, movement etc) and 'including' them when/if needed. It makes amending or changing a particular mechanic much easier than having to trawl through lots of events on a single event sheet.