Thanks for the comments on the RF shield cutting
Just hand held a junior hacksaw blade and took my time cutting, then filed the edges of burrs and used some wet & dry to smooth any sharp edges.
Here's a pic of how I routed the cable:
Once folded and taped it sits nicely in the compartment at the bottom right of the Amiga and there is plenty of space between the keyboard for the cable to run back to the Indi!!
I had to put a piece of card over the Indi so the CF + Adapter didn't touch it, this is temporary as i'm going to get a nice piece of red
card to match the Indi