Questions for those that have the FLM conversion

[Physco-Savvy]

Hi, I have a pretty hot nitro savage but I am getting the brushless bug. I thought about converting mine since I already have extended tvps, but I don't like the batteries hanging off the side. I have been looking at the FLM tranny forward conversion and here are my questions.

How well is the flm conversion balanced and how is the handling?

I plan on running a castle 2200kv mmm combo. Is 6s out of the question due to room?

What would be the best battery I could fit with this setup and how much runtime can I expect?

Thanks