
Picasso. Echo - Yes and no. We mean to improve on the current one - if you'd be interested in that, be sure to send me a PM or such

.
In general, of course you could try making a map that is suited to the gameplay - if by "is it possible" you mean "are the tools available to place the buildings seen on the current map ?" then the answer is "kinda" - easiest here would also be to write me, I'd be happy to PM you some more detailed info.
If you mean make a map that is supported by the game out of the box: not the way it's currently setup - ie we'd have to make a variant of the game for it. Alter-Heide (and my) current thinking is to go for just one map for the first real release (and my dream is we could then go for a new map on each further big release). The problem is that for this style of game, game balance is highly map dependent - in a number of ways. And a lot of work on the game from here forwards is going to be balancing....
Caveat: Bob and Skystar did some thinking, and Skystar especially some work, towards a variant that could be played on pretty much any map. And that's an path I think we'll keep ourselves open (perhaps as a modoption) - but I don't plan on spending time on it atm.