hmm, good idea, but this will not work in UE4 without performance-issues (if you cant get rid of all invisible blocks)
I tried it myself, got it up and running, even created chunks and stuff, but the performance is §$/&/"
http://www2.pic-upload.de/img/30424552/UE4Editor2015-08-2814-54-24-70.jpg
I got everything up and running, except the performance-issues <.<
But i have no idea how to fix it in an efficient way.
(The only thing that is a problem for me is to just spawn the visible blocks, everything else is working -.-)
EDIT: There is a working Version somewhere on the Forums, but the creator dodges every question about putting it on Marketplace.
EDIT: Maybe we should work together?