As a banking/finance professional who deals a lot of intermin construction of properties, do not buy a car via loan financing before starting this process. You want the lowest DTI, debt to income, as possible so that you will approves for the most house.
Also, when you are constructing a home, the real paperwork comes after the build is complete and the bank needs a mortgage company to take out the commitment. Lots of people fail at the end of the process because they buy furniture, appliances, or something else on credit which fucks their DTI. In consumer lending, if you don’t check All the boxes, you don’t get the loan. Banks are so fucking highly regulated that if a person with a 400 credit score comes in for a loan, they have to do a full underwrite of the person even though they know he won’t qualify. Fucking fair lending bullshit. End rant.
Moral of the story - you want the lowest and least amount of minimum payments on your credit lines , which includes autos. Also, if you were to purchase a car. They will pull credit and another inquiry could drop you from 740 to 738. A good score to a “fair” score. And this will really mess with your rate!