It depends! Most of his inventions he is not very inclined on allowing to leave his shop, as he would view a majority of them as works-in-progress and is very peculiar about anyone touching them. Enthusiastically show them off and talk about them, how they could better society and even ease life as a whole for whoever once his masterpiece of invention is finished? Certainly!

He could be convinced, if interest is shown, in allowing someone to use his workshop with whatever tools and doodads he isn't using, however. More so if they can pique his interest. Otherwise, not buying a hat? Better be off, or be shown the door.

What you may find -other than a large variety of hats ranging from normal to extremely bizarre- are ways to create various sources of energy outside of dreamotion- steampunk heavy leanings, for the most part. There are also various inventions which can range from very silly things such as walking teapots to not so nice things such as machines that could certainly maim someone or worse, and happen to come in a variety of creative shapes and sizes.

There are, but these are things he is not inclined to share at all. For now. For now.