There are two major errors with the Ziroli kit. The first is the dihedral is too "flat". It should be 5 degrees measured on the top of the wing. The 2nd is, while the plans show the correct nose shape, the F/G nose from Ziroli is to "pointed", looks more like an EC-47 nose. There are other, less noticable deviations from scale that aren't worth the trouble of fixing unless you're going to enter it in the Scale Masters, etc., in which case good luck!
Jon