I really like the standard repair project interface. It lets me add things as I have them without having to have them all in my bags at a single time and it tells me how close I am to have whatever I was working on properly repaired. So why are expanded houses and towers a completely different project interface? (And oddly enough the initial tower construction was also a standard repair interface if I remember correctly.) I get that it's a different "mode" than normal play (ie: design/cultivate), but it still seems to me like I should be able to run by my tower and drop off a girder toward the next floor and carry on my merry way.
Think of the possibilities! You could retire an entire interface from from the game code, gain consistency, and make at least one glitchen happy all at once (and possibly loads of my fellow glitchfolk could be made happy). How awesome is that? :)