They should bolt on there, however you'd need somthing special for the passenger side mount as the IP bracket is part of that mount.. Been a while since I been under the hood of an Omlette, how different are the mounts from a MK1 VW?? You could probably rather easily fabricate the mount you need using one from a VW and the 1.7 Omni...
Keep us posted if you decide to go ahead on this build.. Been contemplating somthing like this myself.. Omni bodes are much easier to come by around here..