36v dewalt packs

my ?s are as follows: :032:

* does this pack just split in half? it looks like its held together with 4 screws

*if one were to to have good general knowledge and skill is it fairly simple to make your own packs

*what configuration would 2s2p yeild, voltage, capacity, im looking to run an hv maxx 4.5 in a revo, 4s maybe?

Thanks for your help, im just trying to mount my motor and speed control, and need to focus on some power for this thing, thanks again.