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I bought this on DTRPG. Whats the best way if you want to do a lot of mecha type combat. Is there a way for everyone to be Bonebonded w/ more diversity. Is that in the original book (Core vs Accelerated)

The diversity in Bonebonded comes from the different characters' aspects and how different the giants are. I also recommend making new stunts because that's a really effective way to differentiate characters thematically and mechanically.

Thank you.

Since I have you here where is the ocean and Viking long ships and raiding and stuff? Can I add that? Is that just the wrong culture? Or maybe if they had access to oceans they'd just leave and not be beset by giants?

There are oceans around Midgard, to the north and west. As well, the Nine Rivers serve much the same purpose, as they cross most of Midgard. 

There are no official rules for ships, though I have had a Bone bonded use Shape the Bones to make their giant into a bone and sinew ship. That ruled.