Newcromunda Underhive: a rulebook review of sorts

I was fortunate enough to get my hands on just the rulebook from the new Underhive box for a reasonable price and this weekend I finally got some time to have a read through. Here are some thoughts for anyone interested in them. First, a bit of context. Necromunda was just announced when I bought my first White Dwarf. I'd been playing fantasy battle 3rd/4th mashup with some friends and Heroquest