Minas Tirith: Snafu Number 1

So I was going back over my designs and realized I had messed up reading some of the numbers... I am currently using google sketchup to attempt to redesign my plan. However, it is fairly quickly becoming apparent that if I want this project to be constrained to the 4ft section of the gaming board I am going to have to cut out some of the tiers. It simply won't be playable otherwise. Right now I am considering cutting out 2 of the tiers. One of the medium size ones and one of the smaller ones. Hopefully this will give me the space I need to make the citadel at the top and have all of the outer levels still be playable.