I ended up with a Large. I don’t know the weight but it’s not heavy at all.
I don’t know about the mix and match thing but all it would take is a phone call. They were super helpful and willing to do custom stuff when I was ordering mine. I was tempted to do a mixture of the top 3 builds (Force/Enve/alloy bar) but instead just went with the stock build.
When I get access to a scale, I’ll throw it on