Roger, it didn't take long to figure out that damaged gear, as some have experienced, is not the fault of the UCD. Like two feathers taped together.
Brian, yes, I am in the process now of setting up an extra engine mount on an old firewall. With the prep work done this way, then the process will be just a swap out when ready. I have to elongate the mounting holes to shift it way over to compensate for the now 4 degrees of right thrust. The larger prop needs this angle. As far as the tank bursting, I think all manufactures make the claim that their products won't burst. The way I see it , you would probably blow a line off before that happens. Who knows? Joe