I can't see modifying a camshaft driven ignition to a chain driven Lucas magneto ($$$ to restore) a step forward.
Jim Comstock posted this.
I have all the jigs to drill a Commando case for the mag mount behind the engine. It requires welding to build up some material for the mounting studs. It is not a minor project -I have done several of them.
You have to use the early style cam or make a custom sprocket for the Commando cam to move the chain position out. Then you need the early intermediate gear and spindle with mods to the timing cover to make it fit.
The nice thing is then you can use the advance unit from the Atlas which is a big plus if you have a high compression motor. It fits right on the Hunt mag shaft. Jim