Jimmy,
I had an electric Sword. I mounted my batteries under the chin cowl which was a big mistake. It took over 8 oz of lead in the tail to get it to balance. I considered mounting them in the pipe tunnel; but, didn't like the idea of stressing the wing bolts with 3 pounds of batteries during high G maneuvers. If I did it again, which I wouldn't, I would bite the bullet and cut a hatch into the top of the fuselage.

I wouldn't convert another Sword (or anything else) to electric because there are a lot better alternatives available today that where not available 4 years ago when I converted mine. There is an abundance of used engines available cheap that would be a much cheaper and a better match for your Sword. If you really want to go electric, I would sell the Sword and put the money towards something like a Vanquish, Monolog or Osiris.

Just my 2 cents.