I saw the pictures of your studio. You have a nice studio.
BTW Doesn't the light reflection which u installed on the magnetic board have a bad effect on print evaluation?
And . . .
Of course, you could paint the galv sheet metal any color you want and use a matte finish if you wanted to reduce reflection. It won't significantly hinder the magnetic properties.
I have a very similar arrangment with metal panels on the wall, but I use these
! Already painted, and already pre drilled for mounting. They also have a color called "city gray" which is about perfect for this use. My panel is 4x8 but composed of two 4x4' sheets butted together. The shipping cost on the full 4x8' sheet makes it prohibitive, IMO. Prices are decent for what you get, and they are shipped very carefully packed. (That was a worry of mine, but they arrived in perfect shape.)
I also use the magnetic pins, but I get mine from K&J Magnetics where I can get a discount if I buy them in volume.
Here's a quick and dirty iPhone photo of my magnetic panel. Forgive the gastly quality (mixed light, iphone, plus oversatruated sRGB export! Ugh...), but I'm in a hurry this morning, and just wanted to give you a rough idea re the gray painted, satin, surface.
Solux sells a 4-head track light
pretty economically that works great above the panel.