There's really no rules to bibimbap. The whole purpose of it is to use up left over banchan (kinda the same idea as the end of the week casserole that some people make with their left overs). At home, you can toss in whatever combination of veggies and meat you like into a skillet and stir fry. Often times we just make a vegetarian version. Then add in cooked rice at the end with an egg and the gochujang. Some families don't even bother dishing it up. Everyone grabs a spoon and they eat it right out of the pan.
The stuff at restaurants is a little bit fancier than the home version for presentation purposes.
Everything in moderation, including moderation.
2007 Rodriguez Adventure/B72
2009 Masi Soulville Mixte/B18
1997 Trek 820 Step-thru Xtracycle/B17