How would you attach this T slot light mount to the stand?

[JoJosReef]

I am getting ready to order black aluminum T slots to make a simple mount for my lights. See tank:

This is the basic concept of the mount:

It will be a single 78" profile going up behind the tank with one profile extending out over the tank and a horizontal profile for attaching lights along the length of the tank. It won't be flush against the tank, as I plan on the return line tubing to be unimpeded up to the return nozzle. Thus, it will be spaced 3.5" behind the tank. It will rest on that galvanized steel pan on a rubber T slot profile foot.

How would it be best to attach and stabilize this to the stand? Would using two 3.5" cuts of T slot connected to the stand by L brackets and to the mount T slot by gussets be reasonable (below in blue)?

Or would that have too much left/right wiggle stress? I could put 4 L brackets on the side of the 3.5" T slots in a + pattern, connected to the stand. Any other ideas for getting this mount up? NOTE: I cannot attach anything to the walls or ceiling.

FYI: the back of the stand is one piece of marine grade plywood. This is the view from the front:

Thanks!

 

[TX_REEF]

I would probably attach it to the wall via studs, if it were me.

 

[JoJosReef]

I would probably attach it to the wall via studs, if it were me.

Can't do anything with the walls, unfortunately. Office lease.

 

[TX_REEF]

Can't do anything with the walls, unfortunately. Office lease.

I see! In that case, I'm sure you can screw the T-slot vertical directly into the stand, I don't see any issue with that.

 

[Brisk]

I have a metal stand and also didn't want to do anything to the wall. I used t-slots horizontally to secure the vertical t-slots. Here are some photos to maybe give you some ideas.