I greatly appreciate the effort at bringing new packages in -- I'm a lisp fan, so clisp especially is -- but would like to point out a couple things. First, GA is right; you do need to get these in extras-devel or extras; this is independent of whether you use garage or not. Second, some of these are already built; at least powermanga, and there's a garage project for freeciv, although no releases. It might be more profitable to work with (or take over, if defunct) the existing project than to start from scratch.
ArnimS did a build of super mario war that works fine in chinook.