I drilled out recesses for the darts to slide into (MojoFett, could you hook me up with some please?). The gauntlet sits pretty straight-up and a drill press did the trick very nicely. What size bit was it? Something about the same size as the rivets I picked up as dart replacements. I carefully measured where to drill, but it seems I still mucked it up a bit. If you look, you might see where I'm currently carving out the button recess so it has room to slide back and forth.
I picked myself up a couple Alco 'tyco-switches' (is that what they are?) for the right gauntlet. I searched high and low for measurements or locations where to drill out for these switches on the right gauntlet, but to no avail. Since every gauntlet out there is a little bit different, the best it seems we can do is 'right around there'. Check your picture references, and use the old Mark 1 eyeball to find a nice spot for them.
Here's where mine are. I at least used a straight edge to get them relatively centered up-down. However, I just used the dremel grinding bit until the switches fit in the hole. I probably should have found the drill bit size and cut proper holes, but whatever. They fit, and most of the battle scars will be covered up with the washers and nuts.
It was quite a battle to get these to fit. I'd be willing to bet that I have about 5 mm of fiberglass and resin slapped on the insides of these things. As well, there was quite a thick layer of original resin to grind through. The bases of these switches are massive, and I don't think they would fit perfectly perpendicular unless you got some old Ruffkin Toys vac-formed styrene gauntlets.
In terms of spacing the switches out, I referred to reference pics as best as I could. However, I ended up putting them a little too close together. I had to grind the edges of the switches down in order for them to fit next to each other and not look cross-eyed.
I'm hoping that the switches are still functional. I'd like to use them as helmet rangefinder servo switches; one brings it down, and the other brings it up again. Hopefully there's still room for an RF board in the gauntlets.