Blockchain is 17.3GB. Even with a indexes and everything it shouldn't need more than 30GB, or am I wrong. Not sure what "special technology" you use, but submitting txs to the network is very simple. I'm aware that there is not much " premade software" for blockchain explorers, at least not very good ones, hence the "Need Devs" title. At this rate it seems I'll just have to develop it myself.