When I started looking up Warhammer 40k, I had selected the regular Space Marine book and a few models as a reference. After finding out how incredibly powerful scouts could become, I decided that a good chunk of my forces would be scouts; luckily, I found a specific chapter online that did just that: Storm Giants. Unfortunately, I found out later that Storm Giants are not a selectable chapter in the Codex, only the vastly different Storm Lords. So, considering that specific chapters in the codex get a bonus for every unit being from that chapter:
First, Are the Storm Giants listed in a specific Codex?
And second, What chapter would the Storm Giants be considered as far as bonuses go?