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I see you also opened a ticket, so it's going to be best to collaborate on that instead. But I will respond here as well in case anyone finds this...
Unless you're entirely distributing third-party, vendor-provided packages (i.e. you don't move them through a pipeline like Dev > Test > Prod), then BuildMaster is quite important to manage this pipeline , especially in regulated environments.
Regarding HA, it's best to first come up with a list of questions you'd like us to help with, and then we can research and figure out how best to help. For example, we can't really help on selecting or configuring a particular brand of load balancer; that's something generally done by your IT/NetOps folks, but we could point you to Microsoft's NLB documentation (which has step-by-step instructions on how to set it up).