I say, forget the see-through bottom, and go with a wooden bottom. Then load the inside with extra wood, which should double as reinforcement if you do it right.
You can easily get more creative with adding weight. Gorilla glue will be your friend, it will glue layers of sheet metal to each other and to the wood even. You can still make it nice by adding an additional thin layer of wood on top of the sheet metal, and painting it to your hearts content, so it matches the rest of the box.
This is assuming you don’t have the means to cast metal into the bottom of the box, or make the box out of marble.
On my SF4 SE, I used stick on wheel weights. After you take the back panel off, I stuck them to the metal panel itself on the inside. They are super low profile and dont interfere with anything inside. I work in the automotive industry and got them from my work, Pepboys or anyother auto store will stock them super cheap, too!
I used them b/c I wanted it to be heavier/more sturdy, hope that helps, cheers mate!
that seems like an awesome idea. what are the stick on wheel weights normally used for? there’s a hardware store by me (no auto stores around here in NYC) and i don’t want to walk in there and be like, “I need them to weigh down my fight stick” lol. also, how easy is it to remove them once you’ve stuck em on, in case i don’t like how it feels?
I don’t give a shit about my coffee table, so i just grabbed some 3M Dual Lock strips and slapped em onto the table and the bottom of my stick…basically works like velcro.