His laser equipment shows that there is a gradient of about 3 to 4 inches between the two hulls.
His final solution is in order to ensure perfect level, some sort of a platform to house both the hulls must be constructed. Yes...that is the perfect solution but I am not prepared to spend so much time and money to get absolute perfection. I also remember that most Wharram designed cats only use rope to tie the hulls to the beam.
I resorted to the traditional way of using the pendulum bob and the leveller. Now one most important primitive equipment that I used was based on the principle that water finds its own level. So a small transparent hose was purchased and I measure the hulls from a datum to ensure that the hulls are on a same level and perfectly up right.