Why the DIY when you can get a hardware wallet cheap?
I believe you already contributed to a thread I made about Ledger Nano S and the shipping issue I faced. Anyway, I'm not not looking for an alternative to make a brainwallet but instead, to be able to export private keys from other wallets using the seed (Electrum, Blockchain.info, Mycelium etc.)
Its exactly the one, so It was BIP32 instead of BIP39 and that's why the website didn't work. I appreciate your help