Help me make this wood frame sturdy

2 Attachment(s)

Hi;

Am a novice here when it comes to wood working. I was trying to build a frame that will go on top of a display piece.

As you could see it in the picture, I have made this frame using the miter joins and then used silicone to glue the glass.

I did tried to use the thin glass (1/8") but still due to the size it is too heavy and I am afraid that the frame won't be able to take the load if I try to lift it.

I am thinking if there is way I could make it stronger, may be by adding support on the backside of the frame?
As a last resort I need to remove the glass and use plexiglass instead.

Experts please advice if I could fix this somehow?

Attachment 398234 Attachment 398235

Will the frame remain in place continuously or will it open and close?

It will remain in place

Reinforce the back of each joint with a flat metal bracket then get help from another person to install them. Once in place they should be okay. Cheers