yep!
I was also getting bored of the movaje tank. But the stock tank doesn't match my plans of a more classic 70's styling with spoke wheels, bump seat etc.
Therefore I took the tank of a xs1100. It doesn't fit like a dream, i didn't liked the filler cap, and it was rusted from the inside. Therefore I cut it in pieces and welded it into a new tank on the basis of an old TR1 tank so it would fit like a dream on the Original mountings.
Left the xs1100 tank on the tunnel of a tr1 tank, and right the Original tank:

here the tank is welded, prepared for painting and a stock tr1 for a last fit. Also note the straight line of the bottom side of the tank, that will fit a classic seat way better:

currently it is awaiting the delivery of paint.