I could do it
its just a money issue at that point though.. the materials alone would be upwards of 100 bucks for just a simple iron/brass/nickle..
Basically to make mokume gane you start with strips of different non ferrous metals for the most part.. you then put them in a clamp type of thing and either fuse them in a kiln (best way) or in a forge/furnace.. It works out to be a big solder/braze joint basically.. and you have effectivly laminated metals..
on a side note, if you take a stack of quarters, stick them on top of each other and slap on a c clamp.. you can make mokume gane
but anyway once you have a billet you hammer/press it down into a workable sheet sort of thing, and alter it with cutting tools to expose more of the layers, then hammer the whole thing flat once again to bring the layer's up to the surface..
if that didn't make any sense just google it.. but to give you an idea.. just for convinence lets say a pgp has 3 .75in diameter x 7in tubes.. each one would have to be solid then bored out unless you could some how roll it into a tube shape or extrude it.. so on top of it having to be a solid 7in rod you would have to modify the layers to get the desired pattern, so you'll probably start out with about a 1.25 in rod..
so yeah, lots of waste but could be worth it