Update to my earlier post. In poking around on this list and the Alembic list, it appears all the early Spoiler basses had solid koa wings. So the one I had really wasn't that rare. Just early.
And during the last 2 1/2 months, the Epiphone EB-0 has been entirely modded. Only things left original are body, neck, tuners and bridge. This bass could be "the one". It's got the feel and sound where I want to pick it up and play. Still hearing the song of GAS, but it's tough to get excited about something else right now. (And, yeah, that will probably pass in the next 3 months. Old enough to know better, but still young enough to dream.)