is there any How-To available which explains in detail how to setup an own block explorer? I have few full-nodes running out there and I'd like to test this as a side-project of a local full-node. Currently I'm using the data files of LoyceV which I'm very satisfied with. But as mentioned before, it requires regularly downloading those huge files. So I'm looking forward to hear some helpful tips how to setup my own block explorer which I could use for querying addresses. I also did not understand why I would need an SPV or Electrum server for that purpose ?