This one is 6ft wide at the platform. 6x12' . I've seen a few others that were 6ft also and they seemed pretty cool in action. Even showing multiple people jumping around with no stability issues. Many people say they are slow but I will build some nose cones to hopefully help hydrodynamics.
After painting the bottom of the platform and the barrel supports , I proceeded to permanently mount the barrels using the strapping, which fits almost perfectly in the barrel grooves. I'm very happy these barrels have the enforced sides with the strap groves, the straps fit nice and snug in there and they don't move.
They are all mounted now and I used 8 barrels. The bung lids have really nice soft gasket lids , so I used a little Teflon tape and simply snuged tight the nice gasket type bungs. I mouted the bungs horizontal rather than vertical, which also somewhat hides the gallons level indicators on the sides, up into the platform.
I forgot to photograph after installing the last 2 but I assure you there are now 8 barrels on the platform, and there's still a few inches left in the front for nose cones.