G15 Jungle Belt

Hello,

I'd like to know what are the requirements to make the G15 Jungle belt (Heart of the Jungle - Sky).

As far as I know, you need 8 Jungle Stones + your G14 belt, and you need to go in the Jungle Ruins to see the NPC when the event opens. But, what I'm unclear about is whether or not you need higher Craftsman skill to make the belt.

You need Craftsman lv6 to make the g14 one, so do you need lv7 and 8 to make the G15 and G16 one? Or do you only need level 6 for all three?

Thanks.