I have prepared a brand new box and most of the components for my 18CLE copy which I got from the author. The map is a little bigger but it consists of 6 parts and fits perfectly into the box which is the size of boxes from DTG.
I used the old Cleveland map from 1877.
If you like it then you can download my project here: http://www.jelawi.info/18xx/18CLE_box.jpg
If you do not know how to prepare a box, read our guide, you will find it here: https://www.railsonboards.com/2017/10/01/how-to-make-a-box-like-a-gmt-one/
A few photos of the final appearance of the box: