Luggage or Suitcase Layout Recommendation

I received an email a few days ago, requesting a recommendation of a suitcase or luggage layout. This is something I know very little about, because I have never owned a suitcase/luggage layout.

Here is the letter.

"I've been in N-scale for a long time, but what I'm looking for is a Z
scale built by a quality builder in a piece of luggage, a suitcase. No
junk. J.Z. FL"

Any recommendations?

John