DM2 Arcade Button Mod Wiring Help

Hi everyone,

So i'm trying to see if i could put arcade buttons into my crappy Mixman DM2 controller.... I took the thing apart and just looking at 3 simple buttons the circuit has me kinda confused so i was wondering if someone could give me some tips on this.

So heres a picture of the circuit:


Heres what i THINK the circuit is currently:


Heres what i THINK i should wire the new buttons as:


I'm not sure if those resistors are of any importance.....hmm..
Any help with this would be greatly appreciated!