Thanks Jeff.
Anyway, just when things were looking promising, I took the car for a quick drive last week for the first time on the street in over 6 months, and of course my driver side power window decided to break at that very moment! I've been told it's probably the regulator guide rails for the window, I'll find out soon.
I also noticed some tuning issues while driving it, but that will be sorted out in time.
Just to rub salt into the wounds, I got some much more frustrating news today.
Back in February I renewed the rego on my MR2 over the phone. They said there was a 'data error' or something, but by the end of the phone call they said that they had sorted it out and renewed my rego, and it was charged to my credit card. I was a bit worried by the initial 'data error', but I forgot about it after a while and moved on.
Anyway, a few weeks ago I noticed that you can do a free rego check online at myRTA, so I did it just out of curiosity, and it said something like 'there is an inconsistency with RTA records', and at that point I started to get a bit more worried.
So, I just visited the RTA for some clarification. It turns out that a previous owner of my MR2 obtained a fraudulent engineers certificate when it was imported. As a result of all this, I have 3 months to get the car fully legalised and certified or my rego will be suspended

It was inevitable that I would need to get it engineered eventually, but I can't put it off any longer. I'm sure I'll be able to get it engineered, I'm just dreading the hassle and extra cost!
Fortunately most of my engine mods (where I've spent most of my money) should be legal. The BOV is plumbed back, the catch can is plumbed back, the boost control valve has nothing going straight to the atmosphere, there is no screamer pipe, the intercooler pipes are bolted to the firewall properly, etc.
I may have to get an emissions test and a noise test, so that would be a big hassle, but I think the biggest hassle will be the brakes and wheels. I may have to ditch the front brakes, and I'm not sure about the wheels.
I'll be organising to have an RTA engineering signatory inspect the car ASAP.