I'm an advocate for recycling also.
Buy and then rebuild as you please.
Best of all worlds.
Cheapest option (most likely),
Cars ready to go of the bat.
Less hassle (rego & compliance)
Still have the pros of "building" and then personalise making it YOUR car.
Still have the excitement of hunting upgrades and satisfaction of watching it evolve.
Everyone wins.
You get a head start and the seller gets what he wants. His old car to a good home.
Ps: Welcome to the madness