SmartRapCore Dual Extruder Concept

This is a concept, I have not jet tested it, only printed the parts.
I would love it if some of you guys could help out with the design of fan mount etc.
Now there´s only two holes to fasten a 40mm fan.

Just a copy/paste from the original parts to hold the extruder.

Duplicated the fan from http://www.thingiverse.com/thing:839620/#files