This one by Chipp Walters ?
https://moiscript.weebly.com/kitbash.html

Seems all is explained ;)
In French but there are some pages translater! ;) https://translate.google.fr/?hl=fr&sl=en&tl=fr&op=websites

And you have all separated objects in one file! ;)

You will find the Custom UI by Max Smirnov on the top of this page!

https://moi3d.com/wiki/MaxScriptArchive

Thanks a lot, Pilou!