Think about ways to use corners and furniture groupings, plantings, lighting, textures and wall hangings to allow for a more homey feel. Having a built in space to put tables and chairs away is helpful, especially right off the dining area. You will want more storage than you think for stuff like decorations, canning supplies, etc. Use narrow tables, 28-30 inches to allow table mates to be closer and intimate. A standard folding table makes you closer to the person behind you at another table than across from you.
Lighting is an important intimacy factor.
Use warm, subdued lighting. If you put mailboxes in the Commonhouse spec the dimensions which are required and be sure they are in a comfortable position. Shop around for lighting. Lots of variation on prices. Put phone jacks and cable tv outlets in several places when the building is being wired so a phone or computer or tv could go almost anywhere.