Thanks to the fantastic work of member @RogerWilco486, my A3000 is back home and good to go. I put her all back together again last night and she fired right up. (I hate that feeling of tightening all of the screws on a case, that sense of dread in my stomach on the first boot-up.)
We're back in the game! Thanks again, RW486
I decided to set her up next to one of my C64s for a change of pace this time, taking the place of my C128Dcr in the meantime.