I wish you the very best of luck with this.
I'll be doing up a 97 Camry once I get it.
Hopefully I'll be able to pick up one with a manual transaxle. (1MZ-FE of course

)
Otherwise, any ideas on how hard it is to swap an auto out for a manual trans?
I won't be doing half as many mods to mine as you will be
A pointer though: You're probably better off going with the V6 than the I4+Turbo, because the V6 has raw power, whereas with the I4+Turbo, you're pushing the engine (probably past its limits), and shortening its life.
I'm considering a turbo on the V6, but at the moment, it's the least of my concerns, when the 1MZ-FE puts out 190 horses stock
Oh, and not sure about laws where you are, but round here Hydraulic suspension is illegal.
Go the air bags. Easier to modify and repair yourself

(and cheaper)