Re: [CryptoNote] A complete forking guide to create your own CryptoNote currency

... What aboufor t blockchain bloating problem? Or how does Cryptonote protect againt double spend in case of 51% attack?

CryptoNote to my best understanding is a raw specification. Blockchain bloat is an issue of a specific implementation. It depends on how an implementation works. BoolBerry seems to have a solution to reduce the size of the blockchain already

Will this reference implementation fix the scalability issues?

They said it's pretty much the code base of bytecoin plus boolberry and monero code added in. So once Monero fixes the scalability issues then the reference will have them inside.