Can I sacrifice the same creature twice with Blood Host?
Yes you can, in this case 'another creature' means a creature other than Blood Host, not a creature that you haven't sacrificed before.

Even if that weren't the case once it move from the battlefield to the graveyard the first time the game no longer sees it as the same creature.


  400.7. An object that moves from one zone to another becomes a new object with no memory of, or relation to, its previous existence. There are seven exceptions to this rule: ...


So you are free to keep sacrificing the skeletons and reassembling them as long as you have the mana to do it.