"Hard part is done?"

The hard part is body and paint work. Once its painted, the assembly is the fun part. Bolting all those new shiny parts on and watching it become a car again. Its more satisfying due to the fact that you probably spent a year or several staring at a stripped down shell.
The last 10% of the car is when you have to open up the wallet again to buy all the small (and usually expensive) things that you didn't think about before.