Test flew my 27% today. You should have blocks (covered with matching covering) to glue as stand offs. Be forwarned-- the instructions on my 27% were not good at all. just a few things----If your top wings will not go together check to see if it is hiting the cabane braces-- they have a certain way to go which is not mentioned in the instructions. If Rocko tells you to enlarge the holes and that does not fix the problem, expect him to tell you a new alunimun rib is $15.95 plus shipping. Also, it is easier to mount (and glue) the wood cabane mounts inside the fuse BEFORE you glue the firewall and engine box in place.