Pauly, I have actually been trying to do the very same thing as you although I also have some experience with FileMaker Pro and I do believe that a great solution can be built there that would do everything in one place. None the less, it can be a lot easier and faster to test these things in Excel, which is not a waste because anything you develop in Excel can be used in FileMaker too. Something you mentioned in your opening post is machine time and labor time, which are important factors in accurate pricing and are often overlooked. I use PrintSmith in my printing business and the way that program builds pricing starts out with completing an Excel sheet that calculates overhead, machine time and labor time in something they refer to as a burden rate. Then that is added to the stock cost and other factors to come up with a final cost.
I have separate Excel calculators for
Signs, Heat Transfers, Screen Printing, Embroidery, Thermography, Hot Stamp Gold Foil Pressing, CNC Routing, Sheet Metal Fabrication, Installation/Travel, Laser Engraving, Channel Letters and others....if only I could make time to pull it all together in FileMaker...Bingo...perfect solution!