I dont want to build an EUB, but an actual upright which will be quite a challenge.
You're definitely not kidding about a "challenge"!
I, myself, wouldn't even attempt thinking about building an AUB anytime soon, that's ALOT of work and it's not cheap either. Good luck with it though.
, im basically rounding up all the materials im going to need little by little, and basically schooling myself trough countless articles in the web in my free time , I might buy a book or two like the ones you recommended, but so far articles all over google seem really helpful, hopefully ill be ready to start by next month
Theres even an article about how to make an Acoustic upright out of an Bathtub which looks really interesting.