I've sort of figured out attachments so i just go with meshed armor, it doesn't look to cluttered or bad in my opinion. I'll just stick to this for now until I become even more adventurous
Here are the models I've meshed
http://tovvok.tumblr.com/post/17753222157/these-are-two-new-character-mo...
BTW I'm also xtrider if u didn't catch that. Though I'm sure you have
It involves altering the textures and sometimes playing around with what kind of material "setting" is put on the model, much of what I do involves taking an existing texture and removing (and sometimes adding) parts of the texture I don't want visible, like the arms and legs of a mechaknight for Boomer's torso for example, I also have to make a new copy of the mechaknight model to apply this change too instead of the existing on.
In Spiral Spy if you scroll around a bit in the edit panel you may see under texture things like 'Opaque' or 'Masked', you may have to change that if it says Opaque cause it won't accept transparency when set to that.
To join all the pieces together I use attachments, you have to consider what should be the 'main' model and what should be an attachment, in Boomer's case its actually the limbs that are the 'main' model and the torso that's attached to them, instead of having the torso as the 'main' and attaching the limbs to it. Your attachments can also have attachments, that's how I added in the blast bombs to Boomer's Torso.
Animation opens up a whole new can of worms as you have to set two (or more) animations to run simultaneously so it looks right, in Boomer's case if done wrong it would look like parts of him are lagging behind others, so his body would be going one way while his limbs flail around in mid air attached to nothing. Doing this requires knowing how to set, and reset, animations quite well and how to play with animation and global timing if you want to freeze an animation part way through.
Yeah its a mess...
I suggest you take a look the Battle Axe model that I made before you think about making a half-knight half-something Frankenstein creature as it shows a lot about how to make partial models with textures and attachments.