The table saw is always connected to my dust collector with a couple pieces of 4” flex hose and some 4” sewer and drain PVC pipe and a homemade blast gate. The port on the table saw is at the rear of the cabinet and this particular area of the shop sees the least amount of foot traffic so I have no problem just leaving the ducting on the floor. I also always have a few other cords on the floor here. I see this as the same principle as walking onto a porch. You know the steps are there so you pick up your feet. I know the pipe is there so I pick up my feet. Not a trip hazard in my opinion.
Working on one side at a time, glue and nail the side to the back. Apply glue and drive three 1-5/8-in. nails into each shelf, attach the other side and nail those shelves into place to secure them. Clamps are helpful to hold the unit together while you’re driving nails. Center the top piece, leaving a 2-in. overhang on both sides, and glue and nail it into place. Paint or stain the unit and then drill pilot holes into the top face of each side of the unit and screw in the hooks to hold your ironing board. Mount the shelf on drywall using screw-in wall anchors.
Woodworkers are a social bunch, and there are a few popular forums where people share thoughts on tools, discuss technique at length, and—of course—upload their plans. Some of the most active online woodworking communities include Lumberjocks, Woodworking Talk, Wood Magazine, WoodNet, Kreg, and Sawmill Creek. Search those to see if they have what you’re looking for (either with their built-in search tool or with Google’s site-specific search, e.g. site:lumberjocks.com side table).