The power bus/frames will be rather large with sides at 30 cm / 1 foot and I suspect that they might become a bit rickety with only made with a single 1mm wire each.

So I tried to straighten two wires at the same time using the usual technique - and it worked just fine!

But now I have to choose how I should do the corners - either just straight square 90-degree bend or a a smooth bend.

The grid inside the frame is very strict and square, so it might look good to have the frame a bit soft to contrast to the inside.  Or it might look out of place... I have a hard time choosing.

I think I'll go for the soft bend - and maybe I should make the radius even larger....  Hmmmm....