The first step for me in the construction is to trace out the parts I need to cut on cardboard as a templates... Next I lay the plan out on my building table ( I use a hallow core door panel as my building board). I start with the fuselage cutting some 5/16" sq. strips on a table saw from clear pine or spruce board... lay the 5/16" strips over the plan and pin it down and glue the cross members with thick ca or 5 minute epoxy... I have used balsa stringers as called for on the plans and supplied with many of the kits before,, but what I have found when using balsa strips it tends to break easy when flying and handling the airplane, than I am stuck with a timely repair issue.