luckly I have mine right next to me. you must have used fortune or something
build a normal jet bike
take some shiny spear legs and glue them to a
DA exarch body and use the exarch head too.
now in the right hand give him the spear arm from the Helf prince and in his left, the left biker arm
finally, take the cape thingy from the Helf dwagon kit and add it to where the spear/pole/thing on the back of the jet bike.
thats how I did mine anyway

I'll post pics in a second