It looks like the alcatel one touch (as per your github link) has different display/camera resolutions. The elephone trunk looks like a closer match. When you tried to flash the omnirom, did it come up with something like This package is for "trunk" devices \ this is a VF-895N.? If so, you could try removing those lines from META-INF\com\google\android\updater-script inside the OmniROM ZIP file, before attempting to flash.
Did siljaer say anything about using the Elephone Trunk OmniROM with the SP6? I'm wondering why he directed you to the github page. Maybe he has some knowledge that the OmniROM isn't suitable for the SP6.