Trixbox in a virtual machine (OpenVZ)

Hi

I installed CentOS 4.2 under a OpenVZ (www.openvz.org) virtual machine (like Xen, vmware ...).

I would like to install Trixbox in this VM.

It's possible or I must use CentOS 4.3 ?

How I can download only the Trixbox related files (without Centos) ?

Thanks in advance.

roberto