YOU SAID:

We need to finish making this tower

INTO JAPANESE

この塔を作り終える必要があります

BACK INTO ENGLISH

I need to finish building this tower

INTO JAPANESE

この塔の建設を終える必要があります

BACK INTO ENGLISH

I need to finish the construction of this tower

INTO JAPANESE

この塔の建設を終える必要があります

BACK INTO ENGLISH

I need to finish the construction of this tower