David, all your 'stuff' sparkles with a sense of professionalism. Carbon fiber rods, the utmost in weight control and strength. But findings with the UCD as to its notoriously nose heavy characteristical traits cried out for something more substantial in the tail, therefore the 4/40 rods. Which can be overcome with the battery more aft, but with the slender features of the fuse and the presently known stress that the tail encounters, resulting in undesirable movement around the horizontal stab, I'm not sure if cutting a hatch back there is wise to accomodate the placement of the battery, as well as the weight the tail would encounter. Ater finding stress cracks just forward of the hor. stab. and conferring with other seasoned UCD owners its now advisable to epoxy the 'mount block' of the hor. stab. to the front and back of the block opening in the fuse. Some have gone as far as glueing the hor. stab. as well. You will find that the former in the tail section, between the servo bays, suffers from glue failure, resulting in said movement. Just something to consider and keep a close eye on. Joe