RE: ignition redundancy
I was thinking along the lines of halving ignition capacity, with two smaller capacity 2s lipos Ie. 2 1300's etc, running through something like this:
[link]http://www.hobbycity.com/hobbyking/store/uh_viewItem.asp?idProduct=14464[/link]
Not sure whether this unit has a single or dual output, it looks as though it may have some form of combined backer/controller.