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Nice shed, outstanding presentation.. my pump house needs replacing so this design is a likely candidate.The siding appears to be "ship lap" rather than "tongue and groove". Either works fine, as long as its installed "properly". (so that rain sheds off an isn't invited to come through the joints.I dislike buying expensive lumber and cutting half of it away to make a connection, so I like to use "simpson connectors" an minimize the notching when its possible. Having said that, your notched connections are proper and may be stronger.