Yes, eventually we will migrate as much as possible to maven. I created this jira issue for mavenizing docbook:
http://jira.jboss.com/jira/browse/JBBUILD-346

What about using the com.agilejava.docbkx plugin? All it took to get the 1.0 mc docbook to build was a pom.xml like the following:

<?xml version="1.0"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
 <modelVersion>4.0.0</modelVersion>
 <groupId>jboss</groupId>
 <artifactId>mc-getting-started</artifactId>
 <version>1.0</version>
 <packaging>pom</packaging>
 <name>JBossMC Getting Started Guide</name>
 <description>The JBossMC getting started guide</description>

 <repositories>
 <repository>
 <id>agilejava</id>
 <name>AgileJava</name>
 <url>http://agilejava.com/maven/</url>
 </repository>
 </repositories>
 <pluginRepositories>
 <pluginRepository>
 <id>agilejava</id>
 <name>AgileJava</name>
 <url>http://agilejava.com/maven/</url>
 </pluginRepository>
 </pluginRepositories>


 <build>
 <plugins>
 <plugin>
 <!--
 See the following for config options:
 http://www.agilejava.com/docbkx/docbkx-maven-plugin/generate-html-mojo.html
 -->
 <groupId>com.agilejava.docbkx</groupId>
 <artifactId>docbkx-maven-plugin</artifactId>
 <version>2.0.3</version>
 <executions>
 <execution>
 <goals>
 <goal>generate-pdf</goal>
 <goal>generate-html</goal>
 </goals>
 <phase>generate-sources</phase>
 </execution>
 </executions>
 <dependencies>
 <dependency>
 <groupId>org.docbook</groupId>
 <artifactId>docbook-xml</artifactId>
 <version>4.4</version>
 <scope>runtime</scope>
 </dependency>
 </dependencies>

 <configuration>
 <foCustomization>${basedir}/src/styles/docbook-fo.xsl</foCustomization>
 <includes>master.xml</includes>

 <!-- use separate pages per chapter for HTML -->
 <chunkedOutput>true</chunkedOutput>

 <entities>
 <entity>
 <name>version</name>
 <value>${version}</value>
 </entity>
 </entities>

 <xincludeSupport>true</xincludeSupport>
 <sourceDirectory>${basedir}/src/docbkx/en</sourceDirectory>
 <headerRule>0</headerRule>
 <footerRule>0</footerRule>
 <draftMode>0</draftMode>
 <bodyFontFamily>Helvetica</bodyFontFamily>
 </configuration>
 </plugin>
 </plugins>
 </build>
</project>

Should I add this as a module to the parent pom, so that it can be built from the parent?

There are also docs under kernel, should I add something similar to the kernel pom?