Dear Darren: I would like to suggest you: Don't try to replace the cracked sections. Do as proposed by Dan Freeman: reinforce them. It is the best solution.
Just one remark for new builders: pay attention to the orientation of the wood growing rings. For fuselage longerons the best way to avoid cracks is put them vertical (parallel to the lateral covering -plywood). Regards, for all Claudio Holanda
