sbt multi-project war packaging - package

Question

I've been trying to find the way to package a web application composed by multiple projects into a single war. The only usefull plugin I've found for sbt is xsbt-web-plugin. I'm trying to use the War plugin inside that github hosted project, but only de dependencies of the web project are included in WEB-INF/lib (not the other projects defined in the build neither their dependencies). My build file is:
import sbt._
import Keys._
import com.github.siasia._
import WarPlugin.warSettings
object BuildSettings {
import Dependencies._
val buildOrganization = "ar.edu.itba.it"
val buildVersion = "1.27"
val hibernateVersion = "3.6.7.Final"
val guiceVersion = "3.0"
val wicketVersion = "1.5.4"
val jerseyVersion = "1.12"
val buildSettings = Defaults.defaultSettings ++ Seq(
organization := buildOrganization,
version := buildVersion,
crossPaths := false,
publishArtifact in (Compile, packageDoc) := false,
publishArtifact in (Compile, packageSrc) := false,
parallelExecution in ThisBuild := false,
libraryDependencies ++= Seq(slf4j_api, slf4j_log4j12, junit, hamcrest_all, mockito_all, h2, joda_time, guava, junit_interface),
javacOptions ++= Seq("-source", "1.6", "-target", "1.6"),
testOptions += Tests.Argument(TestFrameworks.JUnit))
}
object SgaBuild extends Build {
import BuildSettings._
import Dependencies._
import com.github.siasia.WebPlugin._
val compileAndTest = "test->test;compile->compile"
lazy val root = Project(id = "sga", base = file(".")) aggregate (itba_common, itba_common_wicket, itba_common_jpa, jasperreports_fonts_extensions, sga_backend, sga_rest, sga_wicket) // settings (rootSettings: _*)
lazy val itba_common = Project(id = "itba-common", base = file("itba-common")) settings (buildSettings: _*)
lazy val itba_common_jpa = Project(id = "itba-common-jpa", base = file("itba-common- jpa")) dependsOn (itba_common % compileAndTest) settings (buildSettings: _*)
lazy val itba_common_wicket = Project(id = "itba-common-wicket", base = file("itba- common-wicket")) dependsOn (itba_common % compileAndTest, itba_common_jpa % compileAndTest) settings (buildSettings: _*)
lazy val jasperreports_fonts_extensions = Project(id = "jasperreports-fonts- extensions", base = file("jasperreports-fonts-extensions")) settings (buildSettings: _*)
lazy val sga_backend = Project(id = "sga-backend", base = file("sga- backend")) dependsOn (itba_common % compileAndTest, itba_common_jpa % compileAndTest) settings (buildSettings: _*)
lazy val sga_rest = Project(id = "sga-rest", base = file("sga-rest")) dependsOn (sga_backend % compileAndTest) settings (buildSettings: _*)
lazy val sga_wicket = Project(id = "sga-wicket", base = file("sga-wicket")) dependsOn (sga_backend % compileAndTest, sga_rest % compileAndTest, itba_common_wicket % compileAndTest) settings ((buildSettings ++ warSettings(Compile)):_*)
}
object Resolvers {
val wicketStuff = "Wicket Stuff Repository" at "http://wicketstuff.org/maven/repository"
}
object Dependencies {
import BuildSettings._
... // (plenty of ModuleIDs that are refered from 7 XXX.sbt)
}
Looking at the plugin code it seems it copy all the files from full-classpath configuration into lib directory, but when inspecting full-configuration it doesn't include all the required jars (the ones from the other 7 projects and their dependencies).
Is this the right plugin to use or there is another one?.
Thanks in advance!