Construction started on Sept. 6 with a groundbreaking ceremony for the The Boat House Maritime Pavillion on the Homer Spit at the site of the old harbormaster’s office. Last week, contractors began pouring the foundation for the shelter and gathering space at the Homer Harbor. Miranda Weiss, organizer of the project, said most of the work should be done this fall, with final touches being completed next spring. Bay Welding will begin work on a mast to cap off the pavillion’s maritime design.