I realised that all i have build must be deleted if I want to build things in the correct measurements. On Thursday i saw Nir and since he had done the same project as me last semester he told me what to watch to help solve my problem. http://www.sketchup.com/intl/en/training/videos/new_to_gsu.html this is the link where he told me to watch the first 4 video to help me understand much more complicated things. and next class i will show you what i will be building.