plan for the metro pcs samsung core prime

Hello this is androidadmirer

i recently bought a samsung galaxy core prime from metro pcs

out of the box lolipop 5.1.1

i have an idea how to break this phone loose

but i need some input from you all to see if i'm wrong or if this is possible

so my plan is to use odin to flash the samsung core sm-360hu version firmware and they have a working twrp recovery

then make a rom with the t mobile firmware and insert su in bin and xbin (the t mobile firmware works perfect because it's the same network and same android 5.1.1 o.s

this sounds really good in theory but i don't know if i am totally right

can someone chime in on this please

any help will be very appriciated