That is a great observation; being wise enough to understand how to use money as a tool before using it as a toy.
I met someone who made a large(r) tiny house similar to what you have in mind. I haven't had the pleasure of seeing it yet but it sounds lovely. I hope you post your progress.
If want to see a sneak peek of tiny 2.0 we talk about it here. We will be posting updates along the way too.
-Aimee