When it come to numbers, might it not be better to have as
1 Command Stormraven
This would allow the prospective player to go up to Battle Company strength should they want to, and wouldn't that look fucking awesome?!
Why are you limiting what weapons can be taken? Might it be better to allow the player to take what they want but add in something new for the Command 'Raven? Something that mandatorily replaces one weapon/set of weapons, but gives some benefit. Maybe call it Intergrated Comm, this being the thing that allows On Your Left; otherwise what is the rational behind being able to pass off hits? It should also give other benefits, maybe it can jam enemy auspex, so making any shots at one of the formation re-roll successful hits?