For anyone else searching on this topic..
I found another way to go about it thats a little simpler... perhaps not the perfect way, but it works, and was quicker than anything else I would work out.
1. Use something like 'modules anywhere' or other method of putting a module in content.
2. Create an article ( J!, FlexiCotnet, K2 all seem to work. ) placing only the module in the article.
3. Use a 'code/content in article' module to create links that open a popup window to the articles in a lightbox of your linking ( ie: Rockbox, HighSlide, JCEMedia etc ).
Thats it.. you can then do it just about any way you like.. style things the way you want, use the lightbox you want etc. Its also a good technique for just about anything you want to pout in a popup.
Hope this helps someone / saves some time.. I tried looking at login modules that claimed to do popups, but needed community builder, so they didnt work for me.. I didn find one that was ok.. 'Simple iFrame Lightbox' that worked, but not exactly what I wanted. I tried a few other way I saw around the place and in the end, this was the easiest way.. and it worked.