Lol. Yeah, I can imagine putting 6 inch high ID letters on my 350 gram helis that fit in your hand. Plus, we change “bodies” and other parts all the time. I often fly without the fuselage. No way this is practical even if hobbyists desired to comply.
Q. Will my drone require an N-number or sticker?
A. No. You will receive a unique registration number, not an N-number, and you must mark the registration number on your UAS by some means that is legible and allows the number to be readily seen. The registration number may be placed in a battery compartment as long as it can be accessed without the use of tools.
https://www.faa.gov/uas/registration/faqs/#mou
Is it one
number for all you models or different? Don’t have time to read the the details right now but might comply if it is one shared number and you can write it on the model in your choice of size and location. But even then, some of these models are so sensitive to CG location that a piece of tape with writing could actually upset the center of gravity!