Working directly with the builder is the best. They should take everything in mind. Matt Assenmacher built my bike. He had me bring my current bike in and he did many measurements and my weight. How I like to ride and what I wanted in a new bike. Fast club riding with rack bosses, three waterbottles, etc. They should work with you. I am still riding this same bike with full Campy Super Record. I have updated the pedals SPD and rebuilt the wheels to aero rims. I could ride this bike no handed the first time I rode it. You will LOVE having a custom built frame.