Need some lingo advise here. When considering a HO building structure, I have noticed that some descriptions use the term "kit" and "built up". I assume that the "built up" structure is already made and is ready for installation. I am not sure as to the degree of completeness the kits are. Is there a general rule regarding kits on how they come? Do you have to paint them also? Companies that sell structures assume everybody has been in this hobby for a long time. Any thoughts? Thank you, in advance, for your consideration.