parts finally arrived from akihabara shop yesterday!:
http://www.handlemy.biz/arcade/hori_fs3mod-1.jpg
Seimitsu LS-33 w/ pink bubble top (yellow bubble top too, came w/ the stick), Pink/White Rim PS-14-GN x6, Yellow/White Rim PS-14-GN x2:
http://www.handlemy.biz/arcade/hori_fs3mod-2.jpg
LS-33 w/ the bubble top on, better view:
http://www.handlemy.biz/arcade/hori_fs3mod-3.jpg
Bottom panel removed:
http://www.handlemy.biz/arcade/hori_fs3mod-4.jpg
Ugly hori sticker removed 
http://www.handlemy.biz/arcade/hori_fs3mod-5.jpg
Top panel removed:
http://www.handlemy.biz/arcade/hori_fs3mod-6.jpg
Button tabs (dremel/sand these off):
http://www.handlemy.biz/arcade/hori_fs3mod-8.jpg
Dremeled the tabs off, some of the grinded down stuff from the tabs got stuck in the leftover adhesive from the sticker. I’ll clean this surface completely before I apply the art later:
http://www.handlemy.biz/arcade/hori_fs3mod-9.jpg
Test for art placement:
http://www.handlemy.biz/arcade/hori_fs3mod-10.jpg
Started drilling holes for LS-33:
http://www.handlemy.biz/arcade/hori_fs3mod-11.jpg
Got it mounted, a few scratches from when the dremel went crazy:
http://www.handlemy.biz/arcade/hori_fs3mod-12.jpg
Bottom w/ LS-33 mounted:
http://www.handlemy.biz/arcade/hori_fs3mod-13.jpg
Joystick and 4 bottom buttons wired
http://www.handlemy.biz/arcade/hori_fs3mod-14.jpg
All buttons wired, gonna clean them up when I get home and attach the QD’s to the buttons:
http://www.handlemy.biz/arcade/hori_fs3mod-15.jpg
I’ll post more pics when I finish but hopefully this helps someone out. Pensuke’s LS-33 mounting pics on page 31 helped out lot, also thanks to Shoo
Thats it for now. I’ll probably post a pic of my template too before I go print it.