Geralds,
If you are still searching for a rotomolder who will help with process feasibility, rotomolding tooling and part quotation. Roto Dynamics Inc. in Anaheim, CA will be able to assist you.
Rotational Molding resources:
http://rotodynamics.com/index.php/rotomolding.html
Contact form:
http://rotodynamics.com/index.php/contact-us.html
Videos: