Is there anywhere I can find out the mass distribution of real aircraft in order to determine how much dry mass to give a modded part?

[cosekantphi]

I'm trying to build replica aircraft for use in RSS, and to do so I've been using a combination of procedural wings, procedural structural fuselages, and a variety of cockpits from so many different mods. I'm trying to do it as realistically as possible, so I need to be able to find out how much the cockpit of an aircraft weighs by itself. The dimensions aren't a problem since it's straight forward enough to determine from 3-view line drawings, and I can easily rescale parts with MM patches. And in case of a fuselage that's not circular, I can rescale non-procedural fuselage parts along  a single axis to get the closest match possible. But in both cases I have no idea how much mass to give the scaled parts.

Say I'm building a Boeing 737 replica. Is there any database online where I can look up the weight of individual sections of the aircraft? For example, how much does a single meter of round 737 fuselage weigh? Or how much would the cockpit section weigh (say it's arbitrarily defined as the section between the tip of the nose and a few meters down the aircraft)? I've noticed a lot of RSS/RO command module part configs have a ton of detail in the mass of many individual components within the pod commented into the config. Where does one go to find the same information for aircraft?

Edited February 17, 2023 by cosekantphi