Ok so I have everything working. Still fine tuning the extrusion settings but it prints. I have uploaded the files to Thingiverse.
1.) Get hold of 2 inch L bracket https://www.homedepot.ca/en/home/p.2-in ... 73650.html
2.) Use dremel/metal tool to create hole for extruder barrel and drill extra hole to bolt extruder block to bracket
3.) Bolt corner brace to 3d printed extruder cover. The 3d printed parts include holes so you can line up the L bracket and get the right height. I used whatever screws I had sitting around
4.) Remove the extruder cover from stock e3d hotend and dissassemble
5.) Mount the 3d printed extruder cover using the two stock m3 bolts.
6.) Assemble the flexion extruder, you can use the stock extruder heater.
7.) Replace thermistor with NTC 3950 100K type thermistor. Soldering is required here. I just cut the existing thermistor wire and soldered the new one in.
8.) Mount the heater block and extruder with the stepper motor (similar to instructions for the Duplicator i3 plus https://flexionextruder.com/support/i3-style-printer/
9.) Attach the 30mm extruder fan using m3 bolts and install the Pinda probe in the same manner as stock.
10.) Attach parts cooling fan using 3d printed part on thingiverse (same link as above)
11.) Insert following gcode to reset home Y position
G1 Y25 F1500; move to Y=25
G92 Y0; set this position as new Y0
12.)You will also need to recalibrate the steps per mm for the extruder.
I used the following and assume it will be similar for other systems.
What is outstanding is calibrating the extrusion multiplier and width.