Oh, I know what it takes, it's part of how I make a living.
Time, money for patch panels, materials. Then what about all the places you can't see inside of the structure? Anywhere you weld, it will rust without proper prep and corrosion protection after the repairs.
When you're done, you have a car that looks good, but will likely still have problems down the road. OK if you're not in it for the long haul, but better to start with a better car if it's a keeper.
I don't mean to discourage anyone from chasing their dream, just know the realities going in.