so, in order to have a nice base layout you would need to reload until you get access lift
1) in the corner of the base map.
you could sacrifice a few tiles, and connect the access lift to the rest of your base by sam batteries.
so, you would end up aliens attacking through 1 tile that you can shoot from 2 or 3 neighboring tiles.
2) near the corner of the base map.
you could fill the space between the access lift and the base corner with sam batteries and sacrifice a few tiles and have a connecting tile to the rest of the base
so, you would end up with aliens attacking through 1 tile that you can shoot at from 3 neighboring tiles.
and it would be nice to have the blocked tile at the location that you are not going to use anyway.
now, if the access lift is at the same location in every level (which makes sense) then you will have the same tactical advantage on every level of the base.
so, you made a new base. the access lift was in the center. sssstupid! reload maybe?
Of course, but hangars wouldn't connect to the second level.
so, in order to launch a craft, the pilot and in some cases soldiers would first need to go to the surface and then go down to the hangar from the surface?
what about reloading weapons and refueling and repairing?
wouldn't there be a lot of activity on the surface?
about the sam and hangars:
if the possible number of sam batteries depends so heavily on number of hangars in the base, how are you intending to balance the strength the sam batteries?
the player could have too many sam if he omitted hangars, while otherwise the few sam with hangar might be too weak?
wouldn't it be easier to balance if the player could have a more or less average number of sam, that could only somewhat be increased by omitting a hangar?
and there would be another question: if we have sam, will there be base bombardment from geoscape without aliens attempting to enter the base?
if that is so, there could be a balancing option to make all kind of bombardment damage, both from the ufo and the sam, weak enough compared to the strength of buildings and the ufo.
then, the purpose of the sam would be to force the ufo to land and deploy ground troops rather than stay shooting at the base from the sky.
i wonder in which direction the devs are thinking.