Hey, I just saw this in the Workshop on steam, and left a comment. Might as well repost it here, if anyone else would like to add on or w/e.
Is it possible to make experience be gained over the period of time you are making the object, instead of all at the end? I'd imagine that only gaining xp at the end would defeat the purpose of allowing other people to help, since there'd be no incentive. It might mean that overall more experience is gained for finishing it than in vanilla, but I'd like that better, since it would be taking more time to finish anyways.