Yep, just the shell. There's a few bits that definitely need replacing, as it's cracked / missing bits.
I've previously built the budget build featherweight, and I know Nelly used drill motors before, so will be taking apart the budget and reuse afew parts from that, plus borrowing a few ideas from the Haynes book too.
I'm thinking of going for a flipper rather than the previous hammer, but no firm plans yet.