Aircraft with wet fuel tanks use sealent so, why not do the same by making a steel or aluminum tank with rivets and sealent?
Also, any place under the bj60 or inside,for a spare wvo tank? Wonder if cutting out the sheet metal under the rear seat, and welding in a steel tub to hold the would work for a tank ? Its a interesting idea that could work. The seat mounts would stay in the same place. Tub depth would depend how far it can extend so it does not hit the drive line bellow it.
Also, any place under the bj60 or inside,for a spare wvo tank? Wonder if cutting out the sheet metal under the rear seat, and welding in a steel tub to hold the would work for a tank ? Its a interesting idea that could work. The seat mounts would stay in the same place. Tub depth would depend how far it can extend so it does not hit the drive line bellow it.