Sounds like you have good plans. Making project lists on paper, yes, I said paper, will help you to visualize your project better and get a visualized cost analysis. Remember, things cost more than expected and take longer than expected. Getting the car solid first is always the better plan then going for "bling" item first. However, sometimes they are one in the same. Who cares how nice it looks if it always breaks down.
I try to purchase most everything I need for each project before I start but there are always additional things needed to complete the projects that need to be bought at the time the project is being done.
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