Mods:
Here's what I did:
>>Add about 2-3 degrees of right thrust on the motor (I think I recall reading somewhere that the newer UCD kits might have the thrust already built in. My kit didn't have any, so check yours before hand.)
>>Take ALL of the supplied 2-56 rods and replace them with 4-40 rods. (2-56 is okay for the throttle)
>>Replace the tailwheel assembly. The supplied one will put too much stress on the rudder hinges the first bad landing. (I used a Sullivan unit.)
>>Some have had concerns on the horizontal stabs. I added light weight fly wires which are no more than kevlar string threaded thru the horizontal and vertical stabs (CA glued in place), then attached at the lower part of the fuse with couplers.
>>Reinforce the landing gear block as this is a weak area. Just pre cuts some triangle stock and epoxy it in place. (not a lot of room to work here so make sure your pieces fit before you glue in place. A small inspection mirror helps here.)
>>Out of personal preference, I did not use the CA hinges but rather installed Klett pin-point hinges. (Again, this is personal preference, many like the CA hinges with 50 degree throws......I do not)
>>If you are going with a YS engine or using a pump, it is VERY favorable to put the tank on the CG. This requires a little cutting and sanding to make the tank fit.
Best of luck, I'm sure you will get more responces but you will enjoy this plane.
.............Mark