Finally found an upload that is viewable here.
First impression is not very positive. As mentioned above that delta connection between the warp nacelles is unconventional. If this really takes place during the TOS era, then maybe this is a secret (treaty violating) Starfleet Intelligence design of a Bird of Prey with cloaking technology. But then again it would conflict with the TNG story arc about that Starfleet ship, forgot that ship's name.