You will find that B747-400 has been certified under JAR/FAR 25( Transport Category )with a minimum flight crew of 2 pilots. So no PPL will legally solo this big bird.
B747 ´Classic´ was originally certified either with 3 pilots or 2 pilots and Flight engineer as flight crew.
Yes some aircraft weigh above 12500lbs. But issue is not weight rather than certification.
Cheers from Spain... Rainy, cold Spain. But still Spain.
