Bits from Bytes 3DTouch rebuild

I'm rebuilding my Bits from Bytes 3DTouch printer.
The printer was never any good to begin with and then 3D Systems bought BfB and everything got worse! I want to re-use as much as possible of the hardware but make it open-source.

I AM POSTING THIS AS I DO THE REBUILD, SO EXPECT UPDATES AND CHANGES WHEN I REALIZE I HAVE SCREWED THINGS UP.

IF YOU CHOSE TO UNDERTAKE THIS REBUILD, YOU DO SO AT YOUR OWN PERIL. I CAN NOT GUARANTEE THAT YOU WILL BE ABLE TO PUT YOUR 3DT BACK IN ORIGINAL ORDER.

SOME OF THE PARTS IN THIS REBUILD MIGHT REQUIRE ACCESS TO A LATHE AND MILL.

* The proprietary BfB controller will be changed out for a X4 Smoothieboard
* A heated bed will be added
* BfB extruders/hot ends will be replaced with a 1.75mm E3D-V6 direct drive
* A proximity switch will be used for bed leveling

PART 1:
The first parts I will post here is the new extruder carriage and the extruder/hot end mount.
I am reusing the original 12mm rails and their mounts, so the carriage is mod