I'd complete ALL the wiring and then move to plumbing.... need both of those to fire up the car.
Remember - wiring is ONE wire at a time. Get it right - there's no guessing. Use zip ties and leave the loose -- you can go back and tighten and straighten and clip the ends....
Plumbing is one connection at a time - when I say plumbing I mean EVERYTHING that has fluids. Brakes - cooling - heat/ac.
Then you can close up the dash.
Save some money for heat/sound deadening material -- that will make more of a difference in how your car drives than you can imagine. Theres a bunch of brands -- and even the cheapest of them will make a huge difference.
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