I have 3 of the larger optima batteries that have the top post as well as
the side posts and I want to make custom Bus bars to go across the top and
connect the batteries to each other.

I am having trouble finding copper bars in the thickness I want, would
aluminium do the trick?

There will be one for POS and one for NEG and covers by a plexiglass cover I
made for the battery rack....

The bars will be about 2.25" wide x 1" tall x 21" long and have a hole
tapped in each end for a set scew and 0/1 guage wire and a few smaller holes
on the side for smaller wires for distribution...

Will aluminum work, has anyone here done this before? Also want this to
look nice as its on a truck I enter in shows some times.