Hello World, first post for me here...

Just jumping in, There are Insulated/Refrigerated shipping containers where the outside corrugated walls are filled in with foam and covered in plywood or metal. This is great that:
1) You have a smooth wall
2) The Wall is about 3 1/2 inches, same 'standard' wall thickness used in Sweet Home 3D.

Only problem is that it is a "Thick" Wall. But this makes it easy to use with the Sweet Home 3D program! (Note, most places I know just use a 2X4 stud and a 1/2in sheet rock/plaster board, making a thinner wall! It is very cheap construction!)

Most containers are 7ft tall, a bit confining for a guy like me who is over 6ft tall! But there are taller containers. I believe the tallest is 8'6".

I find Sweet Home 3D to be a great program, been using it for less than a year now in designing container and other types of homes for a few friends.

Keep up the great work guys! Great program! Great Homes!