Depends on your time in my friend, this is just a 3rd edition chaos dread to me.
Did you skip 2nd ed. then?
Nice work on reviving a golden oldie, which by the way is still being sold by GW as the only Chaos Dread available (bar the resin FW ones of course)! It must be one of the longest running models in their lines today...
Did you put the legs on backwards on purpose by the way? And what Legion or Chapter is he/it?