Based on your description of using Revit to export a model for SketchUp online converter software (such as SketchUcation's DWG2SKP or other similar tools), you've successfully converted much of your original design into SKM format, which can then be imported and manipulated within Sketchup. However, the process isn't always perfect due to differences between Revit's modeling capabilities and what SU supports.

Here are some general tips for improving conversions:

1. Keep it simple: Avoid complex geometry whenever possible since this often leads to errors during conversion.

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2. Be patient and prepared - Conversions aren't 100% reliable, so expect issues that you'll need to fix manually after importing into SU.

For specific elements like stairs or railings:

- Stairs: Try breaking these down into individual components (treads, risers) before converting them over since grouped objects sometimes cause problems during import.

- Railings & Handrails: These often don't transfer well due to differences in how they're defined between Revit and SU. It might be easier to recreate these manually after importing rather than trying to troubleshoot the conversion process further.

Roofs:

1. Solid Roofs vs Complex Shapes: If possible, use a solid roof instead of complex shapes like dormers or pitched roofs since these tend not to convert well.

2. Dormer Windows: As you've experienced firsthand, these often don't import correctly and it's usually easier just creating them manually in SU anyway.

Windows & Doors:

1. Solidify Walls Before Exporting:

- If you need solid walls that can receive doors/frames during export (to avoid hollow looking models), try grouping all wall faces together first before exporting as an SKP file.

2. Use the 'Explode' Tool After Importing:

- Once imported into SU, use the 'Explode' tool on any grouped objects to separate them back out into individual components that you can then manipulate further.

By following these tips and being flexible with your design approach when working between different CAD software systems like Revit & SketchUp online converters, you should be able to achieve decent results even if it does take some extra time spent fixing minor issues along the way!

Revit to sketchup online converter