Do it yourself. Basic car wiring isn't a dark art. Finding a short can seem to be, but running a new loom isn't. One system at a time and you'll have no problem. And if you do run into a snag,
you've got about 5,000 people on RRR to ask for help.
I assume those kits are complete. 2500$ seems outrageous for a rat rod. A sparkly show car - sure. Consider how much your time is worth. At 25$/hr, you could work at it for 100 hrs (8hrs a day, 14 straight days) and still break even.
Besides the pride you'll have of doing it yourself, you'll have a better understanding of your cars electrical system.