Mobile isn't going to be great, but we can tweak some things to make it a better experience.
Ability to collapse virtual board and just navigate wizard (see mission bikes builder). Will show a little tab at the bottom you can click to restore the virtual board preview.
Handle wrapping text on portrait phone
Make sure image preview modals work on mobile
Tweaks to drag/drop strips to work better on mobile (remove drag/drop and show some button controls instead?)
Mobile isn't going to be great, but we can tweak some things to make it a better experience.