Normally any fuselage that has been made by the manufactures they will put a trademark sticker inside the fuselage but if there is no sticker in the fuselage it might be a custom made by someone who really good in making a fiberglass thingy...but if the fuselage is a custom made it a bit dangerous due to the fuselage made by manufactures they has been tested the fuselage such the diameters in other words mathematical check, but not with custom made product they just go for beauty rather than practical test on the fuselage. correct me if im wrong it just my 2 sense comments