Okay, this is getting plan confusing now.
Taken from the Gotek thread:
Originally Posted by H.M
This is just wrong. Here is the A1200 floppy ports schematic.
Internal port : DF0 & DF1 available.
External port : DF1,DF2 & DF3 available.
So : Max 2 drives internally & 3 drives externally.
As far i know this is true for all Amiga.
Some seen to think it's possible. I'm surprised that if this is possible there was never a formal board made back when A1200 tower mods were popular.