Nothing big, just small shelters for portals underneath the glowing sap trees. I raise the earth up to the horizontal sap trees, and leave just a small space to place a recessed door that bugs can't fit through. Then I just hollow out the space under the tree for permanent safe portal into and out from said tree. Maybe not the answer you were looking for, but outside of aesthetics there is no reason for a permanent base in mistlands. Portals for sap, make a earth wall enclosed mushroom farm on the edge of a mist area with a nearby portal in a safer zone, and then temp portals outside of dungeons and queen really.... Just bring a full stack of blackmetal bars to mistlands so u can make what you need there.