Thank you :) Yes, the materials works and looks kinda different than in my 3D software, so get it working is a little frustrating. I have to got most of the stuff as polygonal objects, then map textures on it and bake it so I can nicely texture it in sketchfab. Its lucky that I don't need to worry about lighting, because in sketchfab you can do pretty quickly nice 3 point lighting system.
If you have good materials created in 3D editing in sketchfab is then really easy and quick, look at the options for example here:
https://onedrive.live.com/redir?resid=B48DCBF59278BE37!57757&authkey=!AGc22LUXOEqfJLo&v=3&ithint=photo%2cpng
It is always better to show the customers how the models look like in some interactive way than just pictures. But the materials ... oh well :D