You could talk to a welder and see what they come up with then get a good liner/blower.

Maybe you could go with a barrel style hood, something in copper might be nice. try this link
http://ventahood.com/wallmount.jsp

My house is also 1850's & rather than try to replicate a kitchen of the era (basically impossible unless you want to cook on a fireplace, light with candles, & have no refrigeration or ventilation), I kept the philosphy of the original outside kitchen, but used modern materials. The original kitchen would have been extremely plain & utilitarian & to me that's the epitomy of stainless, pro appliances; I also used milk painted cabinets. If the original owner came back today, I think she'd like my new kitchen & wouldn't be the least offended that I used a stainless chimney hood.

Unless you're trying to re-create a house museum, it's almost impossible to have a working, antebellum kitchen or bath. The important thing IMO is that the kitchen blend with the house, while being the functional space for which it was created.

There are a few things you could do.

This mid-19th century kitchen was just discovered in the basement of a large estate house in the UK. So you could do the mantel look above showing the brick as if it were the hearth:

You would make this mantel very high up, hood height, so it would function correctly and actually look like a kitchen you could cook a boar in if you wanted.

Failing that, you could do a matte black hood to mimic the cast iron of the general period:

I don't know why any effort to look period-appropriate is "re-creating a house museum" in your home, yet there's no problem with trying to re-create a restaurant in your home.

I'm all for "period appropriate" in a kitchen if it's doable, & if the OP has a manor house in England, or perhaps a suitably sized mansion in the US, these ranges would be beautiful - cooking on them might be a different matter. It's been my understanding that this type stove was primarily used in the UK & cast iron cooking appliances developed differently in the US, mostly after the Civil War. I'm no historian, though, so don't hold me to it, LOL!

I like the idea of a recessed stove area & if the OP's kitchen is large enough that the fireplace & hearth can be made to appear recessed (similar to the 1st photo), I think it's a possible solution to a hidden vent & a unique kitchen.

In the top photo, I wonder if the entire wall is considered part of the chimney(s) with the stove openings being the 'fireplaces'???????

I saw one on a tour this past weekend who had a brick wall going behind the range and then made a natural stone range hood surround, it looked fantastic. Not sure if that helps you but something to look into maybe.

My first thought, reading the OP's post, was to build a black steel liner that was configured on the outside to include a lintel that could support a brick exterior. Baffle filtration of such a system would look out of place, so filtering of some sort would have to be done far enough up the chimney to not be obvious at the stove. Access to the filtration would be a design project.

Thanks, marcolo, for the historically interesting photo.

kas