I can see this being the type of build that could work really well on a themed team of SoA, where everyone has taken the leadership powers, so you are all way over the softcap for defence, have a load of damage from (up to) 16 assaults running, and so much +tohit it's laughable. Not so sure I would want to play it solo.
It's an interesting idea though. I was actually considering a fully procced out spider for the themed team I play with, we've only had one run out so far and are around level 24, so I haven't actually planned it out yet, it's being played by ear other than getting the leadership powers as early as possible. But running through (and obliterating) the low level content redside was a blast.