Oi mate, sounds like a cool project...don't worry about the purists, haha, they won't be happy with anything but nostalgia. You're building the car for yourself, so yours is the only opinion which matters!
I'd noticed in your build plan that you intend to use the LiFePo (Calb) batteries. They are still a great option, but considering your stated performance goals, they might be a bit heavy for your application. I don't know if you have the same choices in Oz that we have here in the States, but you might want to look at some other batteries with higher energy density. The Calb-type cells are stable, simple, and easy to use, but expensive and heavy compared to cells sourced from salvaged EVs and PHEVs...Tesla, Holden Volt...but the Nissan Leaf might be the most available for salvaged modules in Oz.
I had toyed with the idea of soldering together nearly six thousand 18650 cells together to make a custom pack for my '53 Hudson project before I saw a guy here using some Chrysler Pacifica Modules in his El Camino (I don't know if the Chrysler vehicle is available there, but there's always shipping, lol). I have 62kWh of batteries for about 960 pounds (435kg). I did the math, and the same amount of power in 180Ah Calb cells would have cost nearly 4x more, and added 1.5x the weight and space requirements over my LG Chem modules. Keep in mind that to achieve your stated performance and range goals, you may need a 30-50kWh pack.
High-output DC motors have been the choice for high-performance EVs, and the dual WARP9s have shown many a petrolhead the brilliant EV light...however, AC motors are finally catching up. Weight is your enemy in a car like the one you want to build. DC motors are *heavy. Salvaged Tesla motors are very accessible these days. Some bloke in Georgia, USA, sells turnkey motor setups for far less than you'd spend on those DC motors and HP controller. Another gent in Ireland, Damien MacGuire (he's on here, too, I think, as Jack Bauer) has done amazing work with Tesla controllers, and most of his stuff is open source. There are also many other vehicles to salvage parts from, Nissan Leaf, Holden Volt...
I don't know what you've got to play with, or parts availability, but you might want to look into it. Good on ya, good luck with your project! - Brian in Los Angeles, CA USA
** Edit: Looks like while I was typing away, Duncan beat me to it, LOL