Why not create your own in a VM, using something like Hyper-V, QEMU, VMware, VirtualBox, Xen, (whatever virtualization platform you prefer), etc.? That way,

• you have complete control over the system (so you know what was installed, and any options given),
• you can modify it in any way you desire (for additional testing), and
• you have a reference system for later updates/changes.

As a bonus, someone else does not have to go through their organization's internal hoops of getting permission to allow an outsider access to a machine on their network (which, depending on the organization, may be considerable and extremely lengthy-no matter how trustworthy the individual in question).