Like I daid, the dash is spot welded in place. Getting it out is a big deal.
If the steering column is original, the correct way to remove it involves either lifting the body off or disassembling the whole steering system because the column shaft is pressed into the steering box and they come out as a monolithic unit.
The dash wiring is pretty minimal. You can do all of the gauge/switches work on the floor in the driver footwell and reach through the gauge hole to route it. After that, there are only like 3 wires going across the inner firewall (assuming a stock setup) for the radio and heater blower motor.
It would be a judgement call whether it is worth the effort to pull the seat.
The other thing that you might consider is the condition of your bulb housings/sockets. I pulled my bulbs (headlights, parking lights, etc) and cleaned, repaired, prepped all of their mounts ahead of time so that once I get the new wiring in, I can reassemble those parts and be done with them. I didn't want to get distractes halfway through the wiring by needing to replace a headlight adjustor.
