I'm using these brackets to mount my RA board under my mendel i2, which I have raised with some custom feet I'll upload later.

Oh and get a RA board if you don't already have one, they're big but man they work great and support up to 3 extruders
elefu.com

Print 2 board mounts, and 4 of the hooks, and hook em on some smooth rods or whatever you want. :)

I used .35 layer height and .3 rectilinear infill. Works great