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Ahh...err...umm...welp...so many ways to go about this...but, if the point is saving $$, not just proving a point, that helps...
Things you need to know:
Your "starting" battery isn't designed for frequent, thorough discharges.
Your engine electronics won't function as well at lower voltages; you might lose efficiency in the long run.
Things to figure out:
Range/operating time to a reasonable discharge. (50%)
Where you can charge it. (no, you can't charge at EV charging stations, unless they happen to have a regular outlet, or you're one hell of a whiz with electronics)
What you need the car to be capable of.
Design it so it can be quickly reversed with whatever tools you have on hand.
Figure out backup power, cuz you're going to over-do it one day. Or at least expand your power storage.
For that last one, what do you have handy laying around? Spare car batteries, jumper packs, electric bike or large power tool batteries, what ever else? Have any small engines laying around that you could build a 12v generator out of, should you kill your battery?
Plenty of ways to go about it, using what ever you have on hand or can pick up used for a few bucks.
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