StephT,
You can do anything with a HC machine you can do with an e-machine or treadle .... except go fast.
I put together a HC 99K from a rusted derelict and it sews great.
You go slow so controlling the fabric isn't that hard. Especially if you take the time to check and align the foot to the feed dogs if needed.
The most out of adjustment part I run into with the machines I've purchased is the presser foot. They are generally twisted out of alignment with the feed dogs and the fabric feeds crooked because of it.
As for getting your kids to crank it, not a chance.
Joe