CANEIT, I agree regarding the effect of the quality of the architectural drawings. I have found that with a good comprehensive set of architectural drawings I can usually estimate my effort by considering the time to replicate each of the architectural wall sections.
Recently I was asked for a quote on a job with a very poor set of architectural and structural drawings (i.e. with regard to the cold-formed steel portion of the project), and so I was forced to use a different method to estimate my fee. I added a bit of fee to account for the extra time that I thought would be required to obtain the information that was missing from the construction drawings. Well, apparently I was high, because I didn't get the job. Probably a blessing in disguise not to get that job, but nonetheless, this is the reason for my original question. Thanks for your input.