Thank you guys for the suggestions. I don't have a weld and I never welded before, so no experience in that field. I'm also not an engineer, so I can't calculate how changes to the frame will effect it.
Tim (XS750AU) drawings gave me anther idea, to use 3 brackets, like in shelfs. Maybe they also don't need to go all the way up, just reinforce the lower part of the panel (with cold weld), and let the upper part be more flexible as I think it should.
On the other hand, I don't like to do unreversed action on a machine, like welding or drilling.
I think at this stage this will be something to think about in the future, and probably an outsource job. Anyhow you can't see the bend with the cover and the top grill, which also adds quite a weight that create a counter weight to the lever action.
Jorge, I was afried to snap it or weakening it more if I will bend it to the opposite side. It's funny that your machine is bend to the other side. Maybe it means that the machine wasn't much in use, and the weight of the boiler bend it to his side.