you should think how the system will exist under your platforms. you are thinking that the system is only a stair. so you cut the cardboard once the stairs are over. the result is when you put the platform, nothing happens under it. you should extend some cardboards to have a good system, and create other other things with the same stratification strategy. Things like walls, benches, tables, shelves, ect...your handrail is horrible. it is a foreign element to the system.remove it.keep working, see you tomorrow.