Yep that's Eddies old stove and a nice one too boot! It is the same size as my Star Herald which would make it a 10" fire pot I believe. I would really give it a go after you rebuild it. I have a feeling that it will do the trick for you. My Herald heated allot of my old house on the coast (2500sqft+). I did use the cookstove in the kitchen also for much of the season, but during the more temperate times, just the Herald did the trick. We did have a mildish winter compared to some but the Herald could hang all the way to low teens/single digits before it ran out of juice. When you rebuild the Crawford, just be sure that everythings sealed up as well as possible and especially below the grates. That way you have good control. I've got to think that it would cvertainly be the equal to a Chubby Sr. but maybe some owners can chime in with the pot size on those. That style of stove (Crawford, Herald) have very deep pots also so you can get in more nut than you'd think. It has the round dump style grates with a round grate and dump fork with handle for shaking. You'll find these very different to your prismatics on the #6. It take allot more shaking (a poker helps too) but the upside is that it will burn the coal to powder and does not waste much at all. I'd give it a go!
I only wish you'd told me a week earlier (than you did) that you were selling the #6
, I'd just bought the 116 and committed to that. No worries, I know I'll be pleased with it.
Best of luck and if you need any help or advise with the refurb, just ask and check out the Modern Oak 116 restoration if you haven't for inspiration.