Wife suggestd I post our modifications:
Dog house: We use the 'through' space under the bunk bed to store our dog. I cut out a square hole on the interrior wall and placed a grill. Our dog can see us inside, enjoy the air-conditioning, and not be a bother when we are asleep and dog is out of the way!
Closet: We removed the shelves and installed a hangar-pole at the top for hanging our clothes.
Table: we took out the back seat cushion and moved the table further towards the front interrior wall, using a riser to keep table stable. This allowed more room to manuever in the kitchen area for the two of us!
Furnace: we installed a modern furnace controller module to control the furnace fan from continuously running when out of gas.
Lighting: we installed LED bulbs and battery-powered stick-ons for additional lighting, i.e. water closet, outside step lighting, etc. (it doesn't use as much 12v when at a non-service facility).
STOVE TOP: We designed a large over-lay board (from pergo wood flooring slats) to place on top of the burner eyes to provide more counter space when not using stove top.
Dog house:
(needs rotating for better viewing) Dog can come in and out from outside storage door too! We split the top bunk 'bed' to provide sitting area on the lower bunk and more head room when only one is sleeping here. A dremel and some wood trim dressed off the modification. We use the top bunk right "other half" for storage (we keep the long foam bed cushion at home if not sleeping on it). A baby-rail has lots of uses in this area! (securing loads stored on bunk beds, keeping animals at bay, children at bay, and as an additional shelf for linen (used sideways!)
All this to say that the MPG has been the MOST VERSATILE camper that I have ever experienced! And, it's okay and FUN to modify your MPG for your personal style! Let us know here!