Nice setup!
Another thing to consider is an enlarger without the head. These are very inexpensive these days — our local thrift store just gave two of them away, because they couldn’t even get $1 for them!
Here’s my copy stand setup, using an enlarger. One advantage of the enlarger is the sloped column, so you can move up and down without getting the stand in the photo.
I use polarizing film on the strobes (Speedotron Brownline, which can be had very cheaply), crossed with one on the camera, and can shoot through glass with no reflection.
