How long do you want the project to last?
I spent about 10k on my ke70. But over abkur 4yrs. Started 100%stock and finished id say extensively modified. Never once had it off the road.
Upgrade things over time. Enjoy driving it for what it is and develop the car. Sooo mant people have a project cat in the shed, spend 10k in 1yr never driver it, get disheartened and part it out.
Each to their own but cars are meant to be driven not sat in the corner with a load of parts piled up.