1/5 Brushless 4wd Conversion

[Obeast44]

Got a link to that motor? That motor sounds like itd be plenty powerful for what I need. Especially on 12s.
I was originally thinking of using 4 of the 6s 5800mah 30c packs from hobbycity. I know 4 of those things would weigh a lot, but the 40 minutes of runtime is absolutely critical. When racing I cant afford to change batteries while the gassers can just keep running. The extra weight in batteries is a sacrifice id be willing to make.