Welcome aboard
Tony757. You have some amazing rock which will afford several good ways to aquascape for sure.
You mentioned that the tank is in the nitrogen process and with that said it would be the perfect time to remove the bio balls and put some Live Rock and or live rock rubble in the place of the BioBalls. If your tank matures and cycles with the BioBalls you will get to a point where you will want to remove them but you will only be able to remove a little amount of them at a time versus the remove all stage at this point.
Your wet/dry sump is fine but if you bore of it, it would be easy enough to replace.
Thanks for joining and post updates please.