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Looking good, I just pick one up this same exact color that im gonna put my JZ swap in.. How did you get your front calipers to fit?
There's a thread on CL showing how to make it fit and it's pretty straight forward. As the the 1st Gen GS300, all you need is to do is shaved the dust shields so the Supra TT calipers can fit and bend the dust shields back since the Supra TT rotors are bigger. If you want to make it easier without any shaving or bending, just install it without the dust shield but I don't recommend going that route. All you need is a dremel and little shaving.
As for how to get these parts, I was fortunate to get an awsome deal from Supraforums.com who went all Brembo brakes kit for his Supra. I've seen few members here sell the front for close to what I paid for front and rear.
In my opinion, I like the Supra TT swap more than the LS400 brake because the Supra TT is almost plug n play with very minor shaving on the dust shields where as the LS400 requires shaving on the actual calipers.