After some inspection I've discovered that the board slides into the sleeve, if there isn't any glue on the front of the board and the screen cover is removed, you may be able to slide the whole thing out without having to re-solder anything.
You'd literally just be swapping the ego head with the 510 head, obviously you'd have to pop the top cap with damaging the solder on the atty connections, which is difficult because the wires are very short.
I remember reading that someone had seen the board on the Vmax and wasn't impressed.
I completely disagree as there's some very nice engineering here;
The button appears to be the same as the Ego.