I also only primed on teh skin the areas that mate with other metal. For the top skins I used some heavy kraft paper and painter tapes. I cut large squares of kraft paper and taped them in place.
I was happy with the results. I don't know how much weight I will save, but it has to be some!!
This includes work on 6/26/22 through 7/11/22
Covid controls in public and at work are lossening up very much. It's great to start seeing fellow human faces again!!