Hay T/B
I like your tank plan, but I question having that much weight about 3 1/4 lbs. fwd of the C/G unless I am missing something, maybe a couple of the jet guys saddle tanks in the belly pan at the C/G and yea tat makes for long lines but the engine you going to use should have no problems with them. I have also used the hanging tank platform and use rubber band to hold them in place, seams to work well and easy removal.
PS Please post a side view of the whole fuse, then I wont need to upset you build.
Cheers Bob T