Supposedly, if you're using the 7700 as a transport the power cord really doesn't matter - according to Steve at EA. If you're going to install an IEC I would be careful of the grounding. The unit only has an ungrounded 2 prong power cord now, so I would actually leave the IEC ground unattached, or perhaps only ground it to the case itself.
One other thing, as a stand alone CD player after the mods the 7700 sounds really really nice too. You need a very good DAC to beat it on its own merits. Just missing some leading edge transient detail and punch/dynamics and air. But it is very smooth, extended and enjoyable on its own.
Good luck,
Bob