why not copper 32mm coolant pipe?

Was wondering about using domestic 32mm copper pipe to make up some new front to back colant pipes with a silicone connector in the middle like the JK stainless ones..partly for ease of fitting. I know someone non here or 80-90 has done this but perhaps on a diesel? I've got dg 1.9 petrol and wondered if anyone had used and fitted the stainless pipes and if so because they are in two parts and shorter than plastic can they be fited without taking the petrol tank out? thanks. 
NB Go Westy sell a kit with copper pipe inserts for the plastic pipes as they say that the metal inserts can come loose and pipes split or come off causing calamty. Are they just raising anxieties unnecessarily? thanks. Tim
NB DF solex and manifold for sale £40-

Very philosophical of you, not to say just practical...am also aware of inconclusive arguments but because Go westy were using these copper inserts it got me thinking why not copper pipes bent like the gunzl ones......i expect JK use the same supplier but don't know this. Have also recently seen some thick wall plastic tube but i'm aware its not that easy as needs to withstand pressure and heats.
Good to know that tank needs dropping and i guess i had in mind that its worth seeing whats above it, condition of hoses etc etc. Is there anything else to buy in advance apart from the hose for breathers from tank?
cheers
Tim-

From how similar systems work in the day job, I would suspect that connecting copper pipes to your aluminium engine would lead to the engine sacrificially corroding to protect the pipes.  The problem is that there is a big electro-potential between aluminium and copper.  Non-metallic would be ideal.

I think, as you say, it depends on the corrosion inhibitors.  The copper and the aluminium are connected though chassis earth and through the coolant, which acts as an electolyte.  I guess the answer is, keep on top of your antifreeze.

apart from the issue of electrovalent corrosion due to copper being top of the scale and the steel and alloys being much lower 32mm copper isn't light pipe and difficult to manipulate

I used flexible stainless steel gas pipe. very easy to fit. It has a light rubber coating and can be bent into any position. Fitted three years now. Any gas plumber would have it.

That very helpful info. Sounds like i shall get some s/h plastic pipes, maybe will even get some 32 mm ones to save on pipe reducers cost. Does anyone know if the go westy argument of plastic pipes failing and blowing is accurate and whether as your site suggests Richard that 'small amounts' of stainless as inserts for plastic coolant pipes would be ok?
thanks

Tim