99% there.
So we built a 4.1 LSD with the two diffs (Toyota Crown 4.1 Open + Toyota JZX100 Tourer V 3.9 LSD). The LSD wasn't a torsen when we opened it up, it's apparently some factory option diff above the torsen that you could order from the dealership... If anyone has any further info yell out.
Then I found a deal on some Cusco swaybars with 1000km or so on them, they basically look new.
And the box was converted to a push type clutch and all installed with an exedy heavy duty clutch & light weight flywheel. I went with the fabricators recommendations on the clutch, he's built quite a few R154 shifted cars over the year's so I'm sure it'll be fine.
Manual shifter surround - 99% match which is great.
Interior is basically done now. I picked the car up yesterday and whilst I haven't had a chance to go for a real test drive yet I've noticed 2 things - the R154 shifts like a total dog compared to any SR box & 1st & 2nd gears with the 4.1 diff are amazing! Also it pulls 2,800rpm at 100km/h incase anyone is wondering.