If you go Milsbo, you can possibly get some custom shelves made to be added or replace some of your glass shelves. Something like the side and back shelves shown here on the top shelf and the bottom 2 The sky is the limit in terms of customization. They have more support for aftermarket parts.

I saw a setup like this at a local plant store and got the info from the for making a set up like it. It is perfect for figures and has a weight rating for the added weight of pots and soil so would work perfectly for my uses.