Heaven help me - I've just bought a delta kit :-)

[curious aardvark]

nah - bear with me.
It will fit, you just have to think laterally ;-)
right just about to try first fan clip that's integral to the carriage.

carriageclip1.jpg

carriageclip2.jpg

The fan slides in from the back. The bolt heads will lock it in.
Just about to print a test.
The duct will fit with pegs that push into the screw holes on the fan. Definitely going with polyflex which will make the pegs really tight.
The back of the heat block stays cool when printing, so don't worry about duct touching it.

Once I've got the clip in the right place, and the fan's a good tight fit. I'll reinforce it and work out the duct.
Hopefully I can move it back a little from where it is at the moment.

Just printing clip and a mm of carriage.

Going to try and make the whole thing bolt free. :-)