Also, you can load up an ANH sized helmet with items if you do it right. TK4205 has an RT with fans and speaker system. And one of my garrison-mates rigged his TE2 complete with a RomFX - battery boxes and all - plus padding.
There's certainly less room to work with and it takes more time/skill, but the line that only an FX can accommodate accessories is a myth, pure and simple.