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The Windsong has flat panel deep V hulls which can be built in plywood (as shown here) or with flat panel grp hulls

The bulkheads are set up on a building frame (which ensures everything stays square and rigid). The the stringers are added and faired

You can never have enough clamps! Being used here to glue the inner keel together

Although the wide angle lens distorts the shot you can see how hard it would be to try to manhandle a full length ply panel into position on all the stringers. It's better to do it in separate sheets if building alone

After fitting the plywood hull sides the whole boat is sheathed with glass and epoxy, faired and then painted. Always paint the boat when it is upside down. It is SO much easier

You can see the "wing" on the inner hull side which acts as cockpit seats and interior lockers adding deck comfort and interior room

A centreboard is fitted in one hull. Offset so it does not fill with mud when beaching. It fits under the saloon seat so does not intrude into the accommodation

Turning over and getting ready to deck and fitout

Setting the two hulls up square and level ready to fit the beams (or beam boxes if building a demountable boat)

Epoxy coating the whole interior saves a lot of painting time and ensures a watertight rot-free hull. Especially important below the soles.

Providing the main bulkheads stay in the same positions the interior layout can be altered to suit your own preferences. So this builder, above, has a galley on the hull side. The one below has it across the boat by the aft beam

Adding finishing touches. The catwalk makes it easy to get forward for sailhandling or anchoring

Although it's a blog of a Surfsong build, the building method is so similar to a Windsong that it is worth a study

http://www.navigare.com.ar/construccion_catamaran_27pies_english.html