I created a commercial greenhouse some time ago maybe you can use it to create your own. It's still a work in progress but you're free to use and adapt it for your own use.

You can't see it in the images but you can open all doors and multiple rows of windows in the shell.

https://www.mediafire.com/view/bap769en ... e.png/file
https://www.mediafire.com/view/d9on1j3l ... s.png/file
https://www.mediafire.com/view/y1rcp43y ... e.png/file

Zip with all objects
Zip with the project