Step 3: Support Beam

The main support beam is pretty easy to make:

Materials:
Pine board 1" x 4" x 6'
Wood Glue

This is pretty similar to Step 1. Saw the board into two pieces each 3' long.

The boards should be about the same length. Glue the boards together. One of my boards has about an inch sticking out because my board was 37".
That end will go inside the body. In this case, the 1" difference might be better because the tub is on a slant, making the connection easier.

Clamp the two boards together. The support beam will be holding the body and the neck/fingerboard so it's important that this part is even.