How to make a good Altfire for 2-4 players? I think it's easy or at least easier than many people think.
For example eXile is very good map for 2-4 players and perfect for Altfire. Same with DXMP_ReturnToLandernauBETA, DXMP_Altfire_Prodigy, DXMP_S9 and DXMP_MCI(v0-95). These maps are very diffrent than Scouts, but are good for small number of players also.
When a map is too big and when is fine? For example what is diffrence between DXMP_Condemned and DXMP_EnemyAtTheGates? EnemyAtTheGates is open map, even buildings are open. It's big map, but open and it makes nice distance fights. Condemned has extensive underground and many rooms in buildings. So, often you can't find your enemy and you have to looking for him for long time. It's good example, because both maps have similar size, but only EnemyAtTheGates is good for 2-4 players.
So, what maps can "give" Altfire mapping challenge? It depends on imagination of mappers. I believe it can be really nice maps adjusted for small number of players. I know mappers as Chees and Kalman know how to make excellent map. ^^ Even if it will map similar to Scouts, but better and made by beginner mapper? Better map with Scouts gameplay sounds good, so why not?

I myself have few ideas for Altfire map and these ideas aren't "Altfire version of Iceworld".
About maps for augs. I understand how to play atdm/btdm, but I have very small practice in augs. When I sometimes play augs, I get bad scores usually. It's only for fun. Do you think I can make good augged map?

My friend BBPL has made map for some tournament, which was designed for Altfire and augged gameplay and this map was really good for both gameplays (at least BTMD in case augs). I can try it also, but I can't promise it will good map for augs.