Had another quick question - this is my first real electric plane. Are you all using deans for the battery/esc connection? Also are you using a separate life pack for rx/servos or are you using the BEC on the Castle 100?
both of those questions could take up 20 pages in this forum
basically, for connectors use what you are comfortable. if you like deans, they are great. there are also lots of other options, such as ec3, ec5, power poles, bullet connectors, and a ton more. most if not all are very capable. use what you are comfortable crimping/soldering and plugging/unplugging
As far as rx pack vs bec, again its what you are comfortable with. there are plenty of guys, like joe smith, who use rx packs on everything as it gives him piece of mind and has comfort using it. then there are also plenty of guys like me that use bec's on everything. on your setup, i would put a bec pro in there, but again there is nothing wrong with an rx pack. each have their advantages and disadvantages.