I'm sorry you lost your home to wildfires. That's tough. We know of people from Paradise who moved to Reno and lost their home (again) to a fire here last summer.
I'm a little confused about why you would want to make two walls and the roof opaque. Greenhouses are not usually see through, even with all the walls and root translucent. The glazing and all the plants make them pretty opaque. Your plan seems counter-productive. Depending upon where you live (you didn't say and that's actually important), there could and should be other choices and options. 4' x 10' is a very long, skinny greenhouse. How would you walk through it or utilize the space? What do you plan to grow?
I live at 5000 ft. That's gives me snow once in awhile and temperatures in the teens. I thought I would have to add lights to my greenhouse here in Reno but, instead, I have year round shade cloth.
If you plan to attach the greenhouse to your house, you will need a permit. If you live in a city, you will need a permit for a free-standing greenhouse. If you plan to put a chair in it, that's a different (living space) permit. Have you though of a new 4-season room included in your house design? Then you could make a wall of green to look at.
