Disassemble the wheelbarrow and cut the handles off just below the point where they meet the bottom. This will make crude 'feet' on which the wheelbarrow can stand vertically (pictured)

Using the drill, I cut holes in each end of the wheelbarrow under the lip right in the centre. Symmetry is very important throughout this process as I need the bass to be well balanced when it is standing up to be played.

After cutting out some pilot holes, I used the jigsaw to cut out a rectangular hole at both the top and the bottom, being sure to keep the 'lip' of the wheelbarrow intact.

It's important that the neck goes all the way through the body (cigarbox-style) as this will support the massive string tension when the bass is finished.