You say that you found out the Ertheia client is the same as the client for the server. Wow. You are good. This info has been said hundreds of times, and if you didn't dl the korean client you wouldn't even know that, as the US one doesn't have classic .dats.
You don't have server-side files, only your l2j guess-work that still fails at basic stuff.
You can't even control the client totally like NCSoft to do such a thing. There is no difference between using this thing you call "L2-Classic" and any other client and have those settings. This is simply a god client and has always been, the only difference is that ncsoft decided to make another set of .dats for a 2nd ruleset.
There is NOTHING different on this client to make it worthy of a "classic server" title now. It has the same files that every GoD update had, you are just hyped NCSoft called it "Classic" and changed the ruleset and wanna call your server "Classic" too.
NCSoft can do that as they have all the files to do it - for a private server, this is just marketing. Calling a GoD+ update (or any other client, you could use GF/C4 leaks and change scripts/extend it to be "classic") as classic has always been possible, just use old rulesets/items, however, it seems no one has had this idea of using a new client and old server-rules before NCSoft and now we need to keep reading every week on "uber l2j developer who is awesome and wants our opinion". To run an "older ruleset" in a new client.
Also, when you present your ideas, you should be open to criticism and not expect people to assume everything will work fine. Based on what? If I'm going to play on a server, I want to be sure of how well it runs. Why would anyone commit their time to a server like this? There are far better L2OFF C4 servers that run as "classic" and could have their scripts changed to be "C1 like" or whatever you want. Again, you are just using a newer client with the same old code. I wonder why now only in Ertheia and not before? Run this on your Valiance, this will be the same, as every new item/model won't be used anyway.
Also, as I've actually played there and I'm not not just guessing stuff, it's pretty clear that their formulas are somewhat-changed and if you couldn't get the basics from L2OFF on L2J with all those leaks and all those years, what makes anyone think you will get that now based on nothing and with the server running - for now - only in Korea?
The Ertheia client has nothing special to make it The One Classic Server, it just happens to be the one live when NCSoft decided to do this and instead of making people download 2 clients, they gave us 2 sets of .dats. -retty smart move.
So no, this is shitty. At the end of the day, you are still just emulating and guess-working how the basics work.