I feel like it would be more feasible if time were not a factor. Can you build a custom wire harness for less than a premade one? Where can you cut costs. I did a very thorough cost benefit analysis and built a car on a tight budget with power brakes and steering. Had an 8 speaker sound system and complete car minus paint for about 23k. This is a great start but took me two years to get there. I'm not sure it would be worth the time vs benefit. If it's for fun that is different but it's not a sustainable business model.