I am using Maya 6.0 and the Maya renderer for this project. I have a 3 GHz P4 with 2GB of memory. I haven't run into any problems as of yet. The poly count is getting high (as I knew it would), and it's only an issue when I have the full model displayed. I'm modeling in sections, which doesn't affect my work. When the time comes, I'll have to render this out in layers and composite it all together. Hopefully, there won't be any problems with that.
As for today, I've finally started working my way down the dome. The design patterns on the side are really great to work with. Just adding really faint detail brings out so much great shading and shadows. I love it!

More to come.