Thanks for all the pointers!
The current setup is shot, big bumps on the brake rim, rotting sew-up. I can't even take the Centurion out to see if I can live with an aluminum frame. To put it in context, the Facet was Kinda cheap, so even a $50 replacement would be a capital investment. I've learned my lesson with investing too early, only to find I wasn't happy with the essential rig, so trying to keep it cheap for now - not that there's a SRAM Red upgrade in the future or anything (LOL). As for sewups, I'm just the "patch and pump" type, I guess. I also don't get it with this early model Roval aero-rim+hub, I can't imagine it's lighter with all that extra alloy!