4 nodes isn't a real upgrade in term of quantty but if you have agapite/verite it may be a little upgrade in term of quality so yeah i'll look at the details.
Oh no too bad ! I am asking myself if i could use a 4th mining house but it'll probably be a pain in the a** with logistic. How much are u asking for it anyway ?
Not really had it for sale. just refreshing. Make me an offer if you want to add it to your holdings.