About the unused parts, there used to be a game breaking bug where you could scrap them infenitly, making tons of WP in the process, i used to have some of them but seems like they were out right removed, I do remember reporting this bug
If you enjoyed watching this video, here is some Alpha/Pre Alpha footage from Carltonus you might enjoy. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-S-dVt64p1OE.html