Here is a link to the pictures with the wakeplate: http://www.wakeworld.com/MB/Discus/messages/65921/366235.html
It doesn't impede the wakeplate at all.
In response to questions about CO reduction, If you are just idling, then it does nothing to reduce CO levels. The CO will bubble up through the swim platform. However, at any non-negligible speed (like surfing speed), the CO gets caught up in the prop wash and bubbles out over time (after the boat has passed).
I haven't noticed any loss of performance. Perhaps I lose 1/2 mph at the top end but I rarely run there anyway. The sound reduction is very noticable.