Finished upgrading, transferring and restoring all accounts. I can't say a time because nothing tells me any times, each account is unique and takes a different amount of time to be restored depending on how many addon domains it has, how many files it has and how many databases it has and how big those databases are.
Update: One of the nodes is now completely upgraded and functional, all accounts should be working again, I need you to create a support ticket if you are experiencing any problems. I shall be upgrading the other node soon once I get a bit more spare time but for now I am absolutely exhausted.
Update 2: I have contacted WHM technical staff and they have told me that they believe it is the firewall that is preventing website from loading as it is preventing a service to do with the name servers starting up. As soon as Ecatel/My datacenter reply to me and enable SSH again I shall login to the server and disable the firewall and will decide what to do from there, if it is working obviously I will reconfigure the firewall, if it still isn't working I may have to resort to reinstalling the operating system.