can you come to #jboss-as7 irc channel? we can discuss this there faster.
read this: https://community.jboss.org/wiki/HackingOnAS7
but basicly
do:
git remote add upstream git://github.com/jbossas/jboss-as.git
git pull --rebase upstream master
that will update your fork to latest upstream version.
then do ./build.sh
and you will get 7.2.0.Alpha1 build.
--
tomaz