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I'm settling on doing an Alpha Legion army featuring lots of imperial tech.  The concept is that they work within Imperial space and want to pass as a legitimate chapter whenever possible.  Their inhumanly clever name: THE INFILTRAITORS!  Yeah, I'm sure a dozen of you haven't thought of that before.  Anyhoo, I'm using tac marine bodies and I want to make sure everything will fit together. 

Do the WFB chaos warrior heads need any adjustment to fit marine bodies? 

Are terminator powerfists way bigger than the plastic power armor ones?  I like their poses better and I think you can get them cheap now (thanks, bwbits.com).  I'm thinking of trimming off the cable and replacing a tac marine forearm with just the gauntlet.

Will tac marine arms have any trouble fitting around chaos bolters? 

Finally, how insanely out of scale are the plastic Imperial Guard heavy bolters?  I've been thinking about having my marines carry them around.  Is it totally ridiculous?  Will I need to go up to a 40mm base and give it a bipod to make it work?

EDIT: Will a regular marine head fit into the terminator body?  If yes, is it a lot of work?  I'm probably going to try to make a plastic obliterator.

Thanks.

Marine bolters and Chaos Bolters are pretty much the same.