Actually, my builds of minefield were done in a similar spirit, disabling updater, installer, dbus/gnome. As well as also using Swiftfox patches as a guide to set default cache size and other things. And in addition, mine also disabled the urlclassifier which creates that ever growing sqlite file. But mine did depend on libasound, where the original minefield.tcz didn't.
So mine was not exactly a full build though it was pretty much fully functional in audio/video. I remember discussing whether do disable or leave in features with Matt, and he seems to prefer a more stripped down build than what I produced. At the time I advised to leave the features in as most folks would want them, but perhaps there is room for 2 minefields, one like I did or maybe adding in some stuff, and one stripped down. Or we may just want the custom build to be fully stripped as the official Firefox provides all the bells and whisltes, we will see.
I will get with Matt and see what he thinks about it.