Here's my layout. Grey bag is the 1100, black bag is my old 650.
https://uploads.tapatalk-cdn.com/201...543abb9344.jpg
Grey bag still fills from rear bottom, but the overflow is on the black bag.
https://uploads.tapatalk-cdn.com/201...ba00bbb928.jpg
I made a short connector from new fittings from wake makers and some excess vent line already in the boat:
https://uploads.tapatalk-cdn.com/201...d4c3792964.jpg
The first time or two filling is a PITA to get the air pockets worked out and the bags laying the way you want but they still empty flat with the check valve installed on the black bag.
Also, on my 2013 mojo there was more than enough vent line to run to the black bags under the seats so I didn't need to purchase any excess lines, just fittings to connect the 2 bags. I'm all or nothin with my ballast so I didn't mess with a shutoff or tee between bags, if you do that you may need to reconsider your venting options.
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