some resources i gathered on ENS while researching over the weekend:

ENS EIPS

* ENS standard - https://eips.ethereum.org/EIPS/eip-137

* Reverse name lookup - https://eips.ethereum.org/EIPS/eip-181

* Login with ENS - https://eips.ethereum.org/EIPS/eip-1078

* DNS on ENS -https://eips.ethereum.org/EIPS/eip-1185

* Content hash storage (e.g. IPFS, SIA) - https://eips.ethereum.org/EIPS/eip-1577

* Multi chain addresses - https://eips.ethereum.org/EIPS/eip-2304

*

Deployed Contracts -

* All https://etherscan.io/accounts/label/ens

* Registry - https://etherscan.io/address/0x314159265dd8dbb310642f98f50c066173c1259b#code, https://etherscan.io/address/0x00000000000c2e074ec69a0dfb2997ba6c7d2e1e,

* .eth Registrar - https://etherscan.io/address/0x57f1887a8bf19b14fc0df6fd9b2acc9af147ea85, https://etherscan.io/address/0x283af0b28c62c092c9727f1ee09c02ca627eb7f5

* Deployer - https://etherscan.io/address/0x4fe4e666be5752f1fdd210f4ab5de2cc26e3e0e8

* DNS registrar - https://etherscan.io/address/0xa2f428617a523837d4adc81c67a296d42fd95e86#code

* "Root" - https://etherscan.io/address/0xab528d626ec275e3fad363ff1393a41f581c5897

Implementation Tips

* Deploying ENS - https://docs.ens.domains/deploying-ens-on-a-private-chain

* ENS as NFT - https://docs.ens.domains/dapp-developer-guide/ens-as-nft