Double head printer - on going

Hello Community!

This is my printer Project. So far I have a spark-cube V1.0 printer using an V4 Extruder.
I'd like to update the printer being capable of using two extruders. My plan is to use the big booster extruder of reprap-fab and as usual the nema 17 stepper motors. Therefore I will change the design of my cubicle printer and extend its dimensions.
My design is inspired by the spark-cube design of the-sparklab and other cubicle designs.
So enjoy following and please just ask if you