Definitely aluminum, steel is much too difficult to work and heavy too.

If you need to add more strength to a chassis, then BRACE the underside with
some heavy duty aluminum angle stock, available at most hardware stores. Use
lots of metal screws to secure it and run it (or them) the length of the
chassis. If your clever with your layout you can even bolt the transformers
directly to them.

John



"west" wrote in message
. ..
Thanks to all the RATs for previous advice on custom chassis size. I'd
like
to ask if given heavy enough gauge ... which is better for constructing an
amp ... steel or aluminum? Do they each have their own merits? Thanks.
Cordially,
west