Dear steve and troups I am surprised your not more fimilar with heavy copper
boards, They have been around for many years  however a sort of secret. it
is not only possible to build and manufaturer heavy copper but to do so with
amasing fines of lines and features. No Rudy were not punch or router shops,
In fact in the heavy copper world 6 oz barly qualifies.  typicaly there is
no distinstion between 2 oz boards and 12 oz boards as far as UL is
concerened, once you have a material qualified UL does not specify the
thickness you can manufaturer.
I have a  picture of heavy copper  ie a 4 layer board with 15 oz copper on
the outer layers and 4 oz inner. it powers the Ford electric fuel cell car
on my web page  www.megadawn.com click on the title High powered printed
circuit design
 A far as shops go there are quite a few, in fact im surprised Dave at
rockwell collins does not know his own company ( the board shop in cedar
rapids in fact purchased heavy copper technology from me) they do up to 12
oz boards. UPE is one company ( in fact I use to own it when it was
megadawn). and aurora circuits  also does heavy copper double sided no
plating. most heavy copper boards are a combination of etching and plating,
lines as fine as 10 mil are achivable in 10 oz of copper, as for assembly a
slightly slower speed on a normal wave solder unit works just fine. to ease
assembly some shops make level heavy copper were the top surface is only 2
oz high and the rest of the copper is buried in the laminate.  also
multilevels  is used where the 12 oz heavy copper and 2 oz for SMT pads and
fine traces are all on the same side and interconnected.

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