On the only "free tier" AWS machine t2.micro I cannot run your 4 nodes IBFT example because of lack of RAM.
For all the other systems (parity aura, instantseal, geth clique) I have found a way so that anyone can replicated my results, and without spending money. Please have a look at this results table.
--> Please consider to create something like a quorum-crux-micro with 2 or 3 nodes, additional to your with 4 (quorum+crux)-nodes dockerized network. Thanks!