Think I may have hit the mother lode here.  Just found this site, and it looks like they have rockers and other structural panels that I’ve been searching for.

http://www.oemautopartsandaccessories.com/catalog/parts/view/n/rocker-panel-04631sh2a50zz/v/honda-crx-1989/vtec/94214/pid/3a55577287f8cae4/

Looks promising. If this is the real deal, this is going to save me a ton of fabrication work.