I can't answer all your questions as I am definitely not the expert on SWG but I can answer a few.
Yes, you can still use BBB with SWG. You can supplement with bleach. Many people do especially when they have reason to shock the pool as it extends the life of their cell. As far as sizing a SWG for a pool and whether or not SWC can be used in tandem, I don't know. I'll have to let somebody else answer that part.
Regarding test kits, we like the Taylor K-2006 which can be ordered through the following link and the Pool Forum will make a little money in the process. I believe there is a separate kit for saltwater pool users than you have to buy separately.
http://www.poolforum.com/pf2/showthread.php?t=10006
Glad to have you as a part of our forum. Hope you find it helpful.
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