Well, it depends on whether you're talking Inquisimunda (which is essentially Necromunda with expanded gang and equipment lists) or INQ28 (Inquisitor played with 28mm models and halved distances).
In Inquisimunda, how you structure a warband is basically defined by the new gang lists.
For INQ28, there aren't any fixed guidelines, as it depends on what the GM and your group agree, but many groups will allow a warband to be as large and varied as you like, but you would then select only some of the characters for each game (often 3 or 4, depending on how powerful each character is and how the GM wants the game to play).
Generally, no, power armoured characters and Space Marines (or both!) aren't hugely welcomed onto Inquisitor tables. It's not necessarily about them being too powerful (although they certainly are pretty powerful), but more because they tend to limit what happens in the game. Space Marines are shock assault troopers. They don't take part in investigations (even with reduced stats!) - it would be a huge waste of their martial skill to have them doing bookkeeping.
For this reason, it's usually easier for the GM if Space Marines are restricted, allowed to be brought in just for those brutal assaults where the Inquisitor (or a Chaos Magus) has a good reason for needing/requesting the help of the Astartes... and even then, they tend to need the odds stacked against them quite a bit.
(If you are going to use a Space Marines though, I strongly recommend the alternative rules in Dark Magenta issue 2, because they don't break the game mechanics in the way the rules in the original book do).
Also, I recommend checking out the Ammobunker forum.
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