Thanks, Tate.
I notice that you have both tanks (independently) going through both filters. I thought about doing this as well. But, since the 4.108 was originally designed with only the engine-mounted filter, I thought that might be overkill... especially if one religiously uses a Baja filter on fill-up. I can't state that as a fact... it was just my impression.
I had also thought about mounting where you mounted yours, and have certainly not eliminated that possibility. You certainly have a clean installation. I have so many things to refit before going cruising, that I opted to rebuild my existing system, rather than buy a whole new system. I hope that turns out to be an acceptable solution.
Alternately, I thought about having each tank run through its own Racor (as it does now), but add the ability to redirect either tank through the other tank's Racor instead. This would give one the ability to instantly handle any situation in which a filter should clog under way. It would also give you the ability to change the dirty filter when sailing conditions are more conducive to the task.
With your indulgence, I have an idea that might improve your own system. I'm not sure that I'd trust a plastic wire tie to hold such an important system in place (and white ties which are less durable than the black ones). I made a quick mockup of something that might work better for this.
The thought was to take a second piece of plywood, mounted behind the main mounting board. Notch it on a table saw with grooves that correspond to the threaded rods holding the tank in place. On the back side of this piece, insert four T-nuts, two on each side. The could correspond to the same bolts that hold the offset mounting base (as illustrated at the top), or they could be above and below this base (as illustrated at the bottom), whichever works better. Using 1/4" bolts (and T-nuts), should give you a much more reliable mount. Just a thought.
Thanks for your input on my own dilemma.
Jack