I was asked whether the platform could handle heavy metal minis.
Well, here is the answer! I dug out my old Lord-of-the-Rings mini collections and crammed all the metal minis that would fit on to the platform.
No problem holding 531grams of metal for my platform :-)

This is the part I made to go under. Very simple. Just some squares glued together. And I am sure you could put another 531grams on it and it still would not break.
I built the new expanded platform with 160gsm paper so that is on the thin end. If you go 300gsm I don't know that the weight limit would be. So safe to say, paper can handle it's weight!
Did I mention I built the new expanded platform? This is what it looks like without distractions.

Happy building,
Chris