How to say "i am this tall" in Japanese?

What does 作りあげるんだ mean in 俺と君とで作りあげるんだ ?

what does this mean? できるのはもう

How did this form? 置いてかないで and what does it mean?

what is the meaning of みません in this sentence ここらで休んでみませんか?

Are there any diffrences between 汚れ and 穢れ ?