Liners are for wood hood surrounds. You just want the chimney hood, period. Now, you do have a choice from many lines as to if you want the actual blower located within the hood itself, or on the roof.

Hi hollysprings,
Thanks for replying. The hood surround will be wood, but chimney style. There will be some metal detailing, but the surround is rift sawn white oak. I hope this will look as good as the architect & designer & husband seem to think. They have a plan. :-) I have a back-up plan just-in-case, but am willing to try theirs first. So far, I've loved everything they have put their heads together on, so I'm willing to give this a go, even if I don't quite "get it" yet.
But, in the meantime, I need to figure out the insides...