I wasn't sure whether to post this in the General Pocket PC forum or the multi-media one, but this forum seemed the most appropriate.
Here's a little something I whipped up on the Pocket PC version of Blender. It was modelled and rendered entirely on the Pocket PC. It's a Work In Progress however.
http://members.dca.net/shinzaho/images/rotunda.jpg
I was informed that it was structurally unsound, but the solution that was given to me makes it easily fixable. Basically it would involve rotating the dome around so the weight of the dome is supported by the columns.