For all who are curious regarding the ambi-dextrous charging handles. Basically I took 2 ACR Charging handles and welded it on to an ambidextrous bolt. I went with a LCT steel bolt because it was ambi but yet the design allowed a battery to be fit in the upper compartment. The initial plan was to use a full bolt replica (VFC) to have it even more realistic, and re-route the battery to the stock tube in the rear. However, I noticed that the integrity of the stock tube & adaptor would be compromised if I drilled holes in the mount to accommodate for wiring, so instead, I went with the LCT option. Here's a picture of the inside and how it is welded:
Oh and also the top cover needed to be cut accordingly to accommodate the left side charging handle, but I guess that's pretty obvious.