Tank is still in the planning stages, though the most probably it will be fabricated out of sheetmetal.
I'm still deciding whether to keep the cable guides under the top frame rail, space the tank and/or make a channel for the rear cables; or cut them off entirely and run the cables through the frame like I did with my chopper.
The hardest part is making all this with hand tools and a hobby mig.
Cheers
Rob