This is a base for Blendtec blender silencer chamber. It utilizes a cheap clear shoe box like the ones sneaker heads would use to display shoes. Specifically this one is the EDS FAM large size 14 that can be found here. https://a.co/d/0f5NFpB8 (This is not an affiliate link).

It uses 8 M3*6 size screw but I've added holes for additional screws if needed. It is designed to be held in place by the weight of the blender.

I built this because all the acrylic chambers I found were too expensive, to huge, or for a vitamix. You are free to modify this to fit your model of blender or whatever else you need.