Dual mod question

I could not find a general dual modding thread soo...

I wanted to start my first dual mod project on my Hori VX-SA for the upcoming Street Fighter V beta.
I plan on using a FC4 with the original VX-SA pcb
Is a Toodles IMP v2 needed for dual mods? I saw people recommending it or is the DPDT switch good enough?

I was going to mod it based on these articles I found. Is there anything else extra I need to know or is it pretty straight forward?

http://www.diyandretry.com/?p=143
http://forums.shoryuken.com/discussion/181053/hori-rap-vx-sa-kai-dual-modding-help-how-do-i-connect-the-guide-and-select-buttons