Simrigs AU is fairly local to me, yes. I got a nice discount and severely discounted shipping, and a free part. I estimate the rig would actually cost perhaps 3000 USD.
Beware when going the DIY route for rigs; the aluminum is usually fine but cheap fittings can/will explode in a few months. The bolts tear through the corner brackets eventually with no warning. I am expecting the Exodus ones to explode eventually, but who knows. If they don't, amazing. The rig is about 440 USD anyway, it should be somewhat of an acceptable quality, but always be prepared for it. Also be prepared to buy an extra nut or two due to bad machining tolerances etc, I think the Exodus does come with plenty of spares.
When I say professionally I mean simulation engineering. I make the individual models for cars and I'm always self-studying to be able to make the general tire, kinematic, drivetrain etc. implementation some day for a custom product.
Well, this is a bit tongue in cheek because it's not my day job nor much of a real job either, more like a small bonus infrequently, but I consider myself an expert and I'm going to grow the business more as time goes on, hopefully start getting some really serious client work. Not much of a driver apart from driving for fun or testing. I've been doing the sim dev thing for almost a decade or so.