I would be very skeptical of anyone bidding a job on a "per day" basis. Too many variables. A little late showing up, a little early quitting, a machine breaking down, an opertor not showing up. What adjustments would be made based on those factors?

I think only the government would accept bids like that!.

We would all like a "firm" price for budgeting purposes, but I would prefer having a customer-contrator relationship with the ability to make adjustments during the job to ensure a quality end product.

probably the greatest single asset a customer needs is refernces of the contractor and a basic price rate for the going hourly rate.

good luck on your project.