8’x6′ Feline Shiplap Apex Double Door Storage Building – Timber Clapboard Storage Units. The Feline Shiplap Apex Double Door Storage Building stands out as an impressive rendition – one could describe it as a dual interpretation – of the traditional clapboard apex concept from Feline, featuring a pair of doors for convenient entry. 8’x6′ Feline Shiplap Apex Double Door Storage Building – Timber Clapboard Storage Units