just build it mindful that everything may not be as you expected. You can measure a crank, measure a bore, check the rings and just replace the bits you have to. presumably you wouldnt build it if the journals were out of tollerance or scored beyond use? you should be plastigauging to check for clearence anyway.
If you dont think you will get half back on what you paid for it, you have very little to loose. Even if it does 'let go' its unlikely the whole thing will be a write off, there will still be some components left you can salvage.
if its not good enough for you to rebuild with then it wouldnt be right to sell the stuff on to some other shmuk