Commercial cabinetry in my world never involves a job site visit with regards to pricing. More often than not nothing is built to even visit when you get the plans and request for pricing. Your only option is to price as best you feel comfortable with regards to your shops capacity as it relates to the project and refine from there. So much of it depends on your reputation, your market, and the work at hand. If your being asked to quote work that will be sent out against a bunch of other shops your going to have to be sharp to win jobs. If your being asked to come in and do some boutique work where you have the opportunity to walk an actual job or some similar property as a means of comparison you are likely operating on a different level (your already the semi-chosen source).
The vast majority of bread and butter commercial work you will never have the opportunity to eyeball evaluate the work nor have the time to scrutinize a job at that level. You or your estimators will have to sit in your office and price simply via the plans and specification's supplied to you. At that point its just straight forward estimating.