Ah yeah I finally stumbled on the Metra and Schose kits, they're *way* cheaper than ordering the factory base-model faceplate. I went with Schose because Amazon can ship it to me arriving tomorrow (this kit:
Scosche NN1665B single DIN - Scosche Ships New Dash Kit for Nissan 370Z ), and then find/make a cover for the other din slot, or something. Maybe find another little cubby for it.