Comment 6 for bug 1549108

It seems your bug is due to two different factors:
 - The clipping path used for the front an back parts is a group, which is not valid (see Bug #1441152 "Create Clip Group generates invalid SVG").
 - The drawing uses a filters that are not exported correctly when the filtered object is outside the page (but it works as expected when the filtered object is inside, or when the filter is removed).

As a workaround, you can modify the clipping path so that it's a simple path (remove clip, ungroup the clipping path objects, select them -without the bitmap part, use Path > Union, and then set clip again), and set the page to the part of the drawing you want to export (select the right part of the drawing, open File>Document Properties, and use the Resize page to selection button).