Free fixed price quote on large site

[Dave A]

I'm wondering how everyone else feels about RFQ's like these.

We've been asked to quote for electrical repairs on a fairly large site - a college campus - which is in pretty poor condition.

There is limited access to the site, and our original plan was to identify the classes of components that might need repairs, and then submit a bill of rates, an estimate of the bill of quantities, and provide for variation orders to cover any variations from the estimate provided (typical construction contract).
However, the client now insists they want a fixed price contract (essentially a turn-key deal).
My electrician advises it will take two days to accurately assess the work needed to restore the installation to full working condition.

There are 4 contractors bidding for the work.
The client expects each contractor to carry out their own assessment of the site and commit to a turn-key contract.
The client is not prepared to pay for the preparation of a bill of quantities.

What would you do?
Pursue?
Walk away?
Any other suggestions?