Thanks for the sample.
I can see that the SVG contains screen coordinates. Those don't need to be projected and should be displayed as is.
In this case the Map should treat the SVG as a plain image.
This also means that all feature coordinates (markers, other layers, etc.) should also be listed in screen coordinates.
The needed functionality is a) support for image layers (not tiled) and b) user coordinate systems.
Neither is exposed by the map in the current version.
Please, file a request for this feature on our UserVoice portal
if you have minute.
This will help us gauge the overall interest and prioritize.
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