I wrote up a basic guide to creating isometric maps in Dungeon Scrawl V2 - you can read it here:

https://blog.dungeonscrawl.com/create-isometric-maps-with-dungeon-scrawl/

If you haven't tried out V2 yet, head to https://app.dungeonscrawl.com to give it a go. The V2 shadows layer is useful for adding depth to isometric maps, which is a nice improvement over V1.

Happy Scrawling!