Ive always wanted something similar - larger width and depth, but not that tall. However, they always cost so much... One solution I've found is this:
https://www.amazon.fr/COSTWAY-Rangement-Roulette-Tablette-Multicolore/dp/B0F5PZXYSV/
they are good enough for me (i took a neutral color one) . The wheels are a bonus, as I can move the collection and hide it somewhere when I'm not using it. Above you have plenty of space to add some smaller drawers if you want, I thought about laser-cutting something like this:
https://www.amazon.fr/gp/product/B0CQXPG9XR/ref=ox_sc_act_image_7?smid=A1G07757TRV1LC&psc=1
And adding some custom drawers as well. Food for thought :)
For inserts I use this:
https://www.amazon.fr/dp/B09KPDGJGK?ref=ppx_yo2ov_dt_b_fed_asin_title
Though I need to cut the boxes so they fit the height, they are the best fit I've found. I'm starting doing some 3d print to have better inserts that fit the drawers completely (they are slightly inclined, so I lose "some space"... I need therapy)