That'll be cool! Dozo! 
Well, these lessons were meant to give readers a basic grasp of conversing in Japanese in the first place. Because of that, I thought that including kana or kanji would be detrimental instead of beneficial. That's why everything's in romaji.

However, this thread also exists if readers have questions to ask, so if you need any explanations on anything including the kana/kanji, feel free to ask away.