Hey art! its fun to run into folks that ordered around the same time that I did!! I will have to watch your build blog closely!
I am one of those that is on the fence when it comes to priming. I know that there are folks that use the two part primers and then there are those that don't prime at all (everyone knows that timeless discussion of "to prime, or not to prime"!!) So, after speaking with my grandfather-in-law, who built an RV-4 in Washington state 20 years ago or so and didn't use any primer, I decided to meet in the middle. I use primer but only on the actual joint locations themselves and with the self etching spray can style primer (the nicer spray can stuff, but still spray can stuff!). So, where the ribs meet the skins or anywhere that two metals meet with rivet points that break through the metal pieces, those points I will prime, but I don't coat the entire inside of the skins. I think that the cladding is sufficient and I think that the extra weight, as little or as much as that may or may not be, is not necessary, for my own personal taste.
Even with the relatively little amount that I do prime, it takes a bit of time. And as I said, I use the self etching spray can style primer, I can only imagine the time you go through with the stuff you use!
It looks like you are doing pretty well with it (and believe me, I have had my fair share of re-ordered parts!!!) and I will definitely have to keep an eye on your build progress! Its a lot of fun!