I thought I may need to keep the entire ignition switch but didn't in the end. I just removed the coil from the Subaru switch and taped the key in the middle, the coil induces a voltage in a chip inside the key which then communicates with the immobiliser circuit and the ECU. The other terminals just swapped over to the VW ignition switch.

I made up a small inline reservoir to stop the pump running dry of fuel, a filter goes there as well. This set up is a bit too noisy and I plan on making up an internal system with another tank.

As the intercooler breaks through the rear bulkhead, I had to make up this cover to keep the electrics isolated and out of the way..

A lot of electrics! When I have any other bugs ironed out of the conversion I'll shorten all the wiring to make it much neater.

You can just about make out the oxygen sensor here.

View of the oil pick up, I had to have the sump welded up when I grounded it and split it open.

At the same time as repair, I had this extra plate welded on the bottom for extra protection. I also raised the rear of the car a couple of inches to avoid any future problems.

Air pressure sensors are mounted on the left side of the engine bay.

While the original Subaru relay/fuse box is mounted on the right hand side.

Here you can see the splash/heat guard of the K&N air filter.

Here's the finished exhaust, with the oxygen sensor in position.