Hello Olivier, Netherlands and Lancia competition's cars lead me to one of my favorites and amazing enterprise, Maturo Competition Cars.
https://www.facebook.com/MCCSport/posts/the-lancia-beta-coupe-group-4-is-99-complete-it-will-be-in-action-next-month-bui/984922476969943/I'm sure you are or should hang around as i could be myself if i had some more spare coins.
BTW, my personal preference go for a much more discrete, elegant (the other Lancia's Ethos), heavily enhanced underneath the skin and very, very fast Beta Coupé. A kind of Maturo Stradale Beta Coupé ! Many here for sure are dreaming of, but the Beta will never worth the money as the Delta Integrale does to make it happen.
Nevermind, my heart beat for the massively underrated Beta.
Welcome on the journey and joy to do it our own way, mostly with our own hands and perfecting skills or not...
Nico