Congrats!
Cooling is an issue, but it can be done. Probably the best bet would be to follow Kyms example, he had the radiator behind the engine at the rear of the vehicle. This eliminates the need for excessive plumbing. I believe he needed to get one piece altere3d, but he used the radiator and piping from the same donor vehicle he got the Subaru motor from.
As for engineering, start by talking with an engineer first. Maybe Shonko can help fin a 'reek friendly engineer for you. Here in NSW, we're permitted up to either a 1.8 turbo or a 2.2 non aspirated engine in these cars. Assuming QLD is something similar, your 2.0 turbo may have issues getting through. But check with an engineer, they may know some loopholes.
The perspex items aren't that tough to get. Make a cardboard template to fit in place of the perspex (you will probably need one for each headlight cover), then take them to your local perspex/plastics mob. They'll cut them to suit (I also had them drill the holes for the screws and latch on the side windows), then trial fit them when you get home. They'll probably need a bit taken off them, a Dremmel is perfect here. You'll need 3mm perspex.
Good luck, and remember to post up photos!