Answers

Energy Seal from Perma Chink.

You can try corn blasting, but it will not remove the pock mark. It will take grinding.

Google

Depends on the style of the house, but most of the time, yes as long as they didn’t cut into the logs at contruction. Cost will vary. Check local listings.

Backer and chinking will work.

I’m sorry, I do not know of anyone in your area.

Yes, it is done all the time. Attach a number to each log and then re-assemble in the same order.

I would push to get complete new construction it sounds like.

Really, not any thing different from a pine log.

You do need to get some sort of venting into the attic. They do make gabel vents that can be installed into log homes.