Chris, You do have several good points.
I noticed the speakers and plan on doing the exact same thing by adding speakers.
In 30+ years of having some form of camper, this trip was the 1st we ever had a TV...was nice to catch the news while sipping coffee....Grandson likes his movies at night. Still figuring out some of the radio/DVD system bugs.
I thought about the furnace intake, and may move it over to the false panel that covers the water filter. will experiment more this winter once it gets cold.
I'll 2nd the pass thru storage, but at least you have access to most of it.
I Love the skylight idea...keep us posted on that. We had to have the hickory cabinets to lighten it up some, but still dark. A lighter color floor would help.
2015 Shamrock 21DK
2005 Silverado Ext cab
Nights camped 2016..... not enough