I've used a bong before. Used the carb for boost reference and the stem for the bypass inlet. Worked well, looked nice, just sayin.
Clear Extruded Acrylic Tubes (aka Plexiglass tubes) are sold in standard 6 ft lengths. Minimum order quantities may apply on certian sizes. Extruded Acrylic material does not machine and polish as well as cast because of its lower-heat distortion point. It is ideal for reinforcing and decorative work.