I picked up a spare ROTF Onslaught at a recent collectors' fair. It was missing the gestalt head and a wheel.
I had a junker G1 Onslaught, so I replaced the ROTF's four larger wheels with G1 wheels, and did a head swap using a nail and a Lego joint. Not sure if I'll paint it to match G1.






Here he is with the rest of my custom energon Combaticons. As you can see I'm missing Vortex.
Unlike my other customs, these can combine! Although Swindle's connection is a bit 'cross your fingers and pray'.