I have followed your directions and have this product working, however, the results are terrible in my theme.
I created a custom theme based on 2012 (nothing special - just another theme with no Widgets or special sauce).
The problem is that your plugin does not just put my page in a iframe, it repeats my who site (header and all) in teh iframe.
My site in question is http://wp.hudsonbigswingband.ca
Any suggestions to help me get through this?