Solid Copper Rod to be used as Wire in amp build?

[Edwii]

I'm interested in doing an amp kit in the future (probably the bottlehead crack). 
I often do over the top / over kill / custom things. An idea I had was to use solid copper rod, like 1/8th inch, to use as some of the power leads or various connections. 
 
I got the idea from a car audio set up I came across  a few years back

 
 
Now, since these are car audio subs (tho nice focal's) I realize you can get away with a lot more than with something as precise as headphone power; which is why I make this thread, I would be using much bigger "wire gauge" that what the kit would come with, but I don't know if the copper content would be pure enough for this sorta thing or if not having shielding would effect the signal.
 
I also realize I would be dealing with house AC power, so no, I wouldn't be using this method on any high voltage areas. And even on the other areas I was thinking of, I would put a couple coats of clear coat/varnish to keep it a bit more insulated.
 
Thoughts / advice?

 

[Speedskater]

Solid copper wire is available in much larger diameters than 1/8 inch.
I'm not sure that a rod (rather than a large wire) would have electrical grade copper.
We sometimes see DIY vacuum tube point to point circuits using heavy solid wire.
Clear coat/varnish won't be a good idea for insulation. You need a ridge construction method or use a sleeve/sheath over the bare wires.
Soldering large wires can be a challenge.

 

[DingoSmuggler]

don't use bare copper for a high volt tube amp unless you want to emphasize on the kill in overkill
 
use proper high voltage wiring and construction techniques

 

[HiGHFLYiN9]

I use thicker enameled copper magnet wire for ground bus wire on occasion, so I suppose it could work for that, however I don't think it would be possible to heat up a joint hot enough with a soldering iron to get anything to stick to a bar that thick.  
 
If you use it for signal wire, you'd run a risk of picking up EMI/RFI or flux interaction from transformers. 

 

[SiBurning]

It's easier to solder wire onto rectangular bar. I've also used them for grounding strips in the past.
 
All this talk of shielding... How ever did people manage any electronics stuff before the pc board?