Hi Mark,

That is very difficult to say without an image, but in general I think you'll be wanting to use the Cylinder Hull for the curved walls and perhaps cylinders of very low height with cut-away and ovality for curved floor pieces, if it's important for the floor to end after the wall!

I have another question related to this. Is there a way to combine objects into one to get rid of lines? I have a square I used for a stage and then put an arched section on the front. It represents it well but clutters up the floor especially on the plot. The same would be true for the wall sections although they are not as bad. I've attached a sample.

If it is an imported object you can select it in your project and from the options choose "remove unessential lines".