I am thinking of doing a build with the Hygge Model S EPS molded frame. I have been reading a little bit here and there in this thread, but since its 45 pages I have not read it all. Is there some usual problems or quirks that you all have discovered when building it up and how did you deal with it? For example I remember reading about the seatpost slipping, play in the headset or just trouble getting the spacers seated properly. I also wonder if I just can use bubble wrap or something similar to put the Di2 battery in the seatpost? And lastly, do you think it would be wise to ask for an extra seatpost and clamp since they are proprietary?