Calling KCRW designers, builders and engineers! The independent radio producers Anayansi Diaz-Cortez and Eric Pearse-Chavez are working on a documentary project called Sonic Trace, which captures the stories of immigrants from Southern Mexico and Central America. They need an eye-catching sound booth that they will transport around town for several months as they conduct interviews. They are asking you to compete to design and build the structure that will house their audio equipment. Sonic Trace will cover the cost of materials and give you or your firm plenty of public credit. Here are more details on how to enter.