Fuselage Block

Description
Fuselage Block: With the Part Properties window, this block can be resized in many ways. It's edges can change shape, it can hold fuel, and it's buoyant. It takes a little getting used to, but it's worth the trouble.

Properties
Fuel, Buoyancy and Dead weight can be set. The Fuselage shape can be changed.

Practical Uses
The most useful and versatile part in the game as it is the building block of many great vehicles.