Awesome collection. I'm particularly jealous of the dev unit as I've been looking for one for a long time. With regard to newsletters, how many were there? I've got a collection dates from January to August '00, but I've not found a description anywhere of what the individual issues were and what dates except that I believe they ran from Dec '99 (which I don't have). Some of mine have Randnet envelopes, I have 2 unfolded.
H4G showed one in an ep last week with a proto dev unit (serial 90000571). Internal layout quite different and the blue plastic finishes were smooth rather than textured. Also showed a possible proto disk which had same smooth blue plastic without texture. According to 64DD serial inventory only 4 known beta/proto units which lack the N64 logo like that. Pretty rare!