This is a very intriguing concept! I do want to express my concerns over mining in these sorts of situations however, specifically if the player didn't have the time/resources to craft, place, and power all the electrical equipment to survive and be able to mine out resources fast enough to prepare for the next horde. Sometimes, a player needs 10,000 lead out in only two or so days. But I'm sure that if these features are ever implemented, that they will be balanced enough to not feel like a detriment, and would only add to the overall 7D2D experience while potentially not creating scenarios like I described above.