That setup looks awesome! I like the idea of using shock cord versus rope for keeping the line taught. I'll probably be changing mine out to the dual system like yours. Luckily the four holes drilled for my setup above are small and can be easily filled in.
Did you run that back inner line through the rear loops where that factory shock cord runs through or is just laying close?
I just finished fishing the Jacksonville Kayak Classic. We had over 400 kayakers entered. The conditions were tough at times with 15-20 knot winds. While my anchor tolly setup worked, there were times where I just put my stake out pole through the rear scupper as that kept my anchor point closer to the center when I wanted to backed up into the bank with the wind at my back.
BTW...all the kayakers that paddled had a heck of a time coming in as most had to paddle against those headwinds to get back to their launch points. The Mirage drive sure made it easy! I talked to guys that had to hug the bank and use there paddles in the ground to move sometimes...lol.
The idea of a anchor point on each side and the ability to adjust either to orientate where you are facing is a great idea. Thanks for sharing!