Oh, the ESCs and those other boxes hardly weigh anything, they're pretty light. But it's the size of the boxes (and the original Option 1 is still in the Panther) that makes placing and locating them (cause some have switches on'em) a pain.
I went with Sabertooths in the Tiger (cause it's original ESCs wouldn't work) and in the Panzer IV. And with Sabertooths it's like an 'empty basement' in there.
I'm going to use a couple of 12v lead batteries wired for 24v. I'm scared of Lipos. I'm planning on putting the Sabertooths under the front hood and the batteries in the rear.
Thanks for the help! Mike