Yes, our group has, and you missed the HBG JU-87G Stuka tank killer. http://www.historicalboardgaming.com/Battle-Pieces--German-Exp--Tactical-Bomber-x5_p_2175.html Put that one on your list- it’s a great looking piece we add with advanced artillery.
One thing to remember is that the HBG expansions are for their Global War (GW) game & rules. GW uses 12 sided dice and a different technology chart, with some easier to roll than others (if I recall). Adapting the special rules in most cases is just a matter of dividing the 12 sided roll by 2 for A&A. But in the Going Nuke scenario the “4 turns of successful tech rolls” equates to paying 2 IPC’s per turn in the Global War game to advance your tech marker along the development line for 4 turns. In GW, you either take your roll for tech to see if you advance the tech marker, or pay 2 IPC’s to advance your marker. So in A&A you could just pay the 2 IPC’s every turn, or whatever your group decides for balance.
There is also a house rules section here that’s worth checking out if you haven’t been there yet, as well as the Global War section.
Our group uses most of the HBG pieces for A&A tech, to differentiate pieces on the board from those with technology and those without (long range vs. regular aircraft, for example). And we’ve added pieces not on the roster but available from HBG, like light tanks and light cruisers. If you’re a piece junkie and you haven’t bought the game yet, check out HBG’s “Amerkia”- it has some excellent pieces and the price has really come down (and it’s also a fun game).
I’ve read the rules on the Atlantis scenario, and agree it looks like it would be fun to try, but on the GW 1939 map. In my opinion, it would be difficult to do on the G40 board because of the smaller number of sea zones. You could probably tweek it a bit to make it work, though. And it would make for a neat twist on a G40 game if it could work.
So… have you thought about painting your pieces yet?