I ordered the items I needed and 4-5 days later a courrier dropped the package to my door with all the items.
I was hoping that if I got a replacement logic board back that worked I could check what it was talking to by firing it via burp proxy. It doesn't look like I'm going to get one back so this is canceled.
My conclusion from all of this is Apple make money because they are good at this and they make great devices (IMO)! The amount of engineering that goes into getting so many small parts into a device is amazing, maximum respect to the people who do this for a living (including Samsung, BlackBerry et al).
It is possible to assemble a device from parts imported from a shady Chinese supplier but it's really not worth the time, effort and chances are they will be 2nd rate parts. If you are struggling to find the money to buy one, check ebay for a damaged device and replace the bits that are damaged.
Now I have a few spare devices I would love to try and do some "chip off" type forensics... I am expecting a lot of collateral damage doing that and at the moment have no idea where to start!