Hi, we’re looking at buying a 750 square-foot cabin built in 1998 using reclaimed logs from an 1860’s barn. We know to get an inspection and tap the logs looking for rot, and to budget $1-$1.50 per year per square foot for maintenance, but what else should we look out for? Also, we would like to be able to add on to the structure in the future if need be. How hard would it be to do this, ideally using more vintage logs?