Hi Damian, there are a few few free rendering programs listed in this thread:
http://moi3d.com/forum/index.php?webtag=MOI&msg=1476.1

But many of them tend to be a bit elaborate and somewhat difficult to use initially at least.

One that people seem to like is Carrara from Daz3D - which isn't free but it is inexpensive.

But it sounds like you may not need to do any renderings anyway since that is not what you planned to do with the model!

- Michael