The nails might be reusable but the bass looks like toast!
I hope you didn't pay for this bass if is so, not much, A professional restoration will out cost its value by far, If this were a $50k+ value bass, I would say the restoration should be done.
I have a blockless bass in restoration but only because it's one of the older and better made ones with nice purfling, nice flamed wood, and as a good quality sound. If it were a plain janer, I would have never touched the bass much less put it in for a full restoration.
On the Cello, take it to a cello/violin shop and get a verbal before you spend a penny on it. It's probably some old German student grade model. I have only seen one Cello in my life on stage with tuners and it was a Prescott so it was excused in my book,