NorCal 6×10 project

I bought this 6x10 in 2006 when I was in college and constantly moving. It's been used to move friends but mainly just sat unused. I planned on selling until i found this forum and decided to keep it. I'm planning a minimalist build, nothing crazy, just something to take a quick camping trips. Upgrades will be cupboards in the front noise area, solar power system, LED lighting, USB charging points, FANtastic vent, two small windows, tongue storage box, and it must sleep 7 (5 kids).
Here it was Saturday:

The kids are small so four can fit on a queen size bed, the fifth on the floor. Here's where I am after some work today, queen size bunk bed:

I might have to insulate the ceiling, the bare metal got pretty hot today. Anyone not insulate and regret it? Summer time we usually backpack and sleep in hammocks, this would be used more for fall and spring camping.
Here it was Saturday:

The kids are small so four can fit on a queen size bed, the fifth on the floor. Here's where I am after some work today, queen size bunk bed:

I might have to insulate the ceiling, the bare metal got pretty hot today. Anyone not insulate and regret it? Summer time we usually backpack and sleep in hammocks, this would be used more for fall and spring camping.