The space on the side was freed up by removing the stock driver, so in the normal setup this space isn’t free. I did reuse the switch portion of the stock flex PCB but the rest was removed.
I see. Thanks for the explanation. 
This OP and pics should get you a good job.
Fantastic.
Thanks for the detailed build description.
WOW, just wow.
tterev3, this mod is astounding, as usual! 
Just a hunch but I cant imagine him not already having an electronics/engineering related job and being able to do this.
You may be right. This is rocket science compared to my “monkey with a soldering iron” style of modding.
This is r/trypophobia material, looks like muscle fibers or something