A cleanroom not yet a clean room

I finished my cleanroom last week. Here's a picture from above.

It's hard to see the plastic curtains, but they're there. The rectangular metal things on top are the filter fan units and the white rectangles are the lights. You can see the switches for the fans and lights on the front right post.

Here's a picture of what we call the q-tester and the trolley I made for it.

The q-tester slowly swings the hanging white blocks, actually 80 lb. lead bricks, around our device so we can calibrate against their gravitational force on our setup. The trolley has small wheels so it can roll on the tracks (going left to right in the picture) so we can move it out of the way to open the bell jar.