Tower Maker

I made a program for a turtle to make a tower. It goes up to a certain height, and goes as wide as you want. It will then make a ladder at the far side of it. Comment with suggestions, and i give full allowance to edit and w/e, as long as i get credit for it.
http://pastebin.com/2TPxwy87

At

heighti = read()
height = tonumber(heighti)
heighti = height

You could use

height = tonumber(read())

And at

widthi = read()
width = tonumber(widthi)
widthi = width

You could use

width = tonumber(read())

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