on my suit, there are no bicep pieces... and the shoulders are velcro attached to torso... the shoulder bell covers down to the elbow, and the forearm piece is large (long) enough that the thickness of one's arms is of no concequence. Padding in the forearm piece is a must, as it is in the legs... I'll take pics soon and post the rigging and padding done in my suit. The only real concern you should have is how it looks without the helm. If you have a small head (or pin head) then the helm is a must, so remember to try to work in fans... if you have a fat head like I, then you can rock out the helmetless look as well as helmed...
Also, you'll notice that my thigh pieces do not wrap the thigh. Many examples of thighless or just plates (like mine) in the artwork of WarHammer. I'm still undecided if I'm going to wear the thigh pieces... but I would highly recommend NOT wrapping your thighs up. Not having an enclosed thigh allows for better movement.
BTW: Besides being a bit thick in the midsection these days, I'm only 5' 10"... This suit would fit someone up to 6' 5" in my opinion... if shorter than I? You'd need to scale it down. HOWEVER: remember that mine was carved out of foam by a friend, not pepped, but all the pepped pieces I've seen have the correct proportions. You need to see the shoulders coupled with the forearms. As a complete look it's perfect... singularly it's a bit off.
Im around 6'2, and a fairly broad build, so I reckon your suit would probably fit me. The only reason I prefer to go PEP is cos im not all that good with scratch building. Cjsuner who commented on this thread earlier sent me his PEP files of the suit, and they all look pretty sweet, so Im thinking I'll make a start soon. It's only standard SM power armour, not termie armour like I was after, But i think it'll still look cool...and I can always mod it, just add a hump and what not to the finished suit...
I agree w/ DB on all that, scale IP, I'm a relatively skiny guy 6foot 175lbs but w/ the chest and shoulders on I'm winder then a linebacker, its the proper scale for me but damn I look thick in it. so dont be disappointed by authenticty nazi's saying arnt you a little small for a space marine, most of the true height space marines I've seen are less properly scaled sure their tall but no where near wide enough for that height so they end up looking funny.
Yeah, im not too worried about what people are going to say about it, I can handle a little criticism. I was just hoping to find a way to make it look just like a real suit of SM power amour, just smaller...but I think I'll be alright with what I got, should come up nicely...