I was thinking more along the lines of
S/hand 1/4cut, door, door trim, airbags, smic, suspension, hinges, windscreen $2k
R34 front conversion $3.5K
Repair and paint $3K
Strip motor and box and refit along with new front yourself aprrox 3 weekends $Free
That's $8.5K plus $4.5K for the car, so $13k
Not too bad for a series 2 with R34 front if you wanted to keep it
(Note my experience is I have done the same type of repair on 8 other cars before)
But as you said, there could be addition damage a few pictures will not show.
On the other hand, if you stripped the car and could sell 90% of the bits it would return approx $8-9K