CHAPTER VII. 1. And all the others together with them took unto themselves wives, and each chose for himself one, and they began to go in unto them and to defile themselves with them, and they taught them charms and enchantments, and the cutting of roots, and made them acquainted with plants. 2. And they became pregnant, and they bare great giants, whose height was three thousand ells. - http://www.sacred-texts.com/bib/boe/boe010.htm `
The biblical ell is closely related to the cubit, but two different factors are given in the Bible; Ezekiel's measurements imply that the ell was equal to 1 cubit plus 1 palm (Tefah),[2][3] while elsewhere in the Bible, the ell is equated with 1 cubit exactly. Ezekiel's ell, by which he gave measurements in his guided vision through a future Jerusalem Temple, is thus one sixth larger than the standard ell, for which an explanation seems to be suggested by the Book of Chronicles; the Chronicler writes that Solomon's Temple was built according to "cubits following the first measure",[4] suggesting that over the course of time the original ell was supplanted by a smaller one.[1] It seems not coincidental that the Egyptians also used two different ells, one of which — the royal ell — was a sixth larger than the common ell;[1] this royal measurement was the earlier of the two in Egyptian use, and the one which the Pyramids of the 3rd and 4th Dynasties seem to be measured in integer multiples of.[5] - https://en.wikipedia.org/wiki/Biblical_and_Talmudic_units_of_measurement
There you go....some of the issues with Enoch that leaves one scratching one’s head. Yet we have that one verse in Jude. It is a truth that Christ will come with a multitude of his saints...other scriptures indicate that...so Jude was certainly not stating a mistruth.
A read thru of Enoch suggests to me a kind of “docudrama” of the first 12 chapters or so of Genesis. It’s as though someone read the verses about the fallen angels and their pernicious offspring and his imagination just went wild conflating the ‘just the facts prose’ of the Genesis accounts with taints of the early Babylonian accounts of early earth into a fanciful tales of 3000 foot giants and scheming genetic manipulative fallen angels. It might have made for a block buster movie....no wait?!....(snicker)
I also got the sense that the book was a compendium, put together from other sources now lost or perhaps hidden from us now and who ever did so was trying to remember/gather together what scraps he could from what was left.
I could see 9 to 30 foot giants of tremendous strength. There are claims of large skeletons and very ancient archeology where blocks of whole stone thousands of tons in weight were set into place with fantastic precision. It would simply all point to the veracity of Genesis as being true.