Cherry Twin Captains Bed.
If you want to make your captain's bed feel real, a double size mattress has another advantage. You might want to give your twin captain's bed a slightly higher footboard (to match the headboard)? And lay a backside to serve as a backrest for some pillows and extra pillows. Although a captain's bed would never be built as a bunk bed, it would often have a raised lip along the front edge.

Extra Long Twin Captains Bed

Finished Twin Captains Bed

Get Twin Captains Bed

Navy Blue Twin Captains Bed

Solid Pine Twin Captains Bed

Tucson Twin Captains Bed

Twin Captains Bed With 6 Drawer Storage

Twin Captains Bed With Storage