Uh. Care to explain? Lt Com Eng, Ens Sci, Lt Uni... how's that fragile?
Run a Lt. Eng and you're really a squishier HEC (I suppose you could run double RSP, you'll prob need it lol). A Lt. Sci and you're gonna struggle as well (though I like those one better, you could go TSS2/1, HE1, EPtS1/RSP1/EPtS3 or something). It's basically an escort without the Def bonus or the speed and turn to get out of arc.
I don't wanna pass judgment too fast because I'm sure someone might be able to bring out its strengths or come up with a build, but really I just can't see it working. Slow, massive ships can't do anything with a Com. Tac that justifies it being on a team. APO has poor scaling, you can't make cannons work and beam skills stop at Lt. Com, so.