I had some time and looked up lemon oil making, but what I found was a bit conflicting.
First method mixes lemon peels with olive oil, then puts it in a warm place for some time. Second method is cold-pressing peels. And third is distilling the oils in a distiller with boiling water or alcohol. Apparently it takes 150 lemons to make an ounce of oil, so it's not very efficient.
I was planning to use the oils for cleaning and skincare, but I think for cleaning purposes the olive oil mixture might not be the best. Although I've read that this kind of lemon oil is great for cooking.