Lucy, while the title that you chose for your essay is interesting, it is not correct when you consider the the essay prompt. Your title describes a piece of construction equipment while the prompt is asking about a place or environment. I will grant you the content of the essay since it pertains to both an environment and place which in this case, is the small house that you are building. I would suggest though, that you limit the description of the house and talking about poring over Youtube videos because that is not really part of the answer to the prompt. Instead, I believe that you would do better to give a more in-depth description of how you feel while you are working on the house.
We need to know why finishing this project is important to you. Most specially since women are not really known for being interested in brick and mortar construction, which is what you are doing. You already explained a little about its important to you in the following passage
What originally started out as a fun project has taken [...] product will also be a functional, mortgage free home.
, you just need to build upon that sentiment.
By the way, you are supposed to pick only one place to discuss in the essay so this passage in particular, ,
My building site consists of our old barn with my dad's dusty power tools, a few stacks of lumber and windows, my sixteen foot long trailer, and my dog to keep me company. Working on my tiny house, surrounded by fall colors and sawdust scented air, is where I feel...
has to be deleted. It is either you talk about the house you are building of the barn of your dad where you are working. Currently, this is an under developed paragraph which has no place in the end of your essay. What you need to do is talk about the importance of the house you are building and why you feel perfectly content working on it. That is the place where you feel perfectly content and it is also the place most meaningful to you.