The fact is until the guy isn't himself a decent dev, no one will join, for sure.
And how the first post has been formed make me think in that direction.
Just forget to make anything if you know nothing about scripting and haven't some russians friends :P GoD changes too much about it, there are a lot of cinematics, a lot of new AIs, a lot of new quests and features, and probably a lot of new packets to sniff and add.
Added to that you must have decent ppl who PLAY on official servers, as currently there is no decent GoD database (both for quests, features, or simply mobs).
Except russians who live from that, don't expect people will begin to dev on GoD (I don't even think L2J is able to/will make it - and basically, they shouldn't begin).
And if you make "for fun", well...