Haven't seen a lot of examples of boards that implement the GA-FC, so here's the one I just put together! (Also posted in r/guitarpedals) : r/ BossKatana
Boss Katana 50 MKII 1x12 Combo with FS6 Footswitch and Cover at Gear4music
KATANA Ultimate Footswitch | AIRSTEP Kat Edition – XSONIC
Review: Boss Katana-100/212 MkII | Guitar.com | All Things Guitar
The Magic Flute - Boss FS-6 Dual Footswitch (Katana 50 Compatible)